international standard - galvanizaÇÃo

8/2/2019 International Standard - GALVANIZAO

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INT'ERNATIO'NALSTANDARD ISO1461Soood edillon199tl-02(I'1

I

Hot diip galvanized coatings on fabricatediron and st:e,ellartleles -Speciflicationsandtest methods.Re~\temefl'ts par galvsnisation ~ chaudsur produits finis ferreux-S:peclf l 'Ca~s' .,*me'thod:es d'-es'$tfl

Reference numbe~'ISO 1461 :1999(E}


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ISO 1461 :~999(E)

ForewordIISO (the lnternatlonal Organ~zation fQr S ta nd arrd liz atio n) is a worldwide,federaJ~lonof n alio na l s ta nd ards bod les (ISO memtier bodies). 'The wo: rk ofprepari ng IlnternaUonal Stall d ard a is r1Q rm aU y ca rri,e d oUrt ~hlm!JJgh IS Otechni cal committees. Eaoh member body i rnterested ina subjed for wh~cli!a tech nilGaI committee has been es:lablisl' i led n e s the right tG l be representedem that eomrrnttee, Intern a t i ons l o rg :i 1l ,l iI iz a ti on . s" governmental OS Iei non-govelmmental, in l ia, ison with ISO, a~so take paJ!iIIinlt i,: wo~k, ISOoo~labor\1)te$cloiSely w ith the I ln t en1 !a li ona I E le~lF,otechnical Commission(lEG) on all maUers o~eleotrolechnica~ slaodiardiz:at ion.IDraJt Intemationall Standards adopted by ~he 'l.Bdhlllical eemrrtttees arecircu'laJled to the member bedies fo r vo tin g. P ubUca tio n as an I rntemat icmal~Standar>CIequite's approvall by ail Ileast 75 % of the member bodll~$ C~$t~!i!g:a \lote.Intemationall Standard :1SO 1461; W'aS prep:aJred by th e EuropeanCommil l teefQr Standa~d~zatio!"l(CEN) in coliaboraUon with ISO TaehniealCommm:ee TC1107, Me'fsllic 8ndO'lller loorgar1ic coatings, SuocomTTll iUeeSC 4\ , Hot dip ooatings (gllwanized, etc.), in acccrdsncs with the Agreementon tech l 'i ll ic a l ooope ra ti ion bel'Weenl SO and CEN (\Ii,e!n naAgreement).IIiII'C lI;J glh oiU lt he te xt Q ftliiis sta nd ard , ra ad ".,. t h ls E UlI'O pe an Standard ..." tomean" ,..this ~ntemat i ,Ql i lal 'S ta in d a I'd ". " ,This second edlilen csncels and replaces the first editi!cm (ISO 1461.: 19(3)as wel l as the fir8t edition off 18014,59, (11801459: 1 97 3}. w h ich has beentechni icaUy revised.Annexes A and B form an integral part of~hi$ ~lnt~n1eJ~io!ila,1tandard.An nsxas etc E are for information onl~rFOIi~he PlJirpo!Se$ of this ~n te rn atio na l S la n da rd , the CEN annex regard~ng lfulfi l lm.ent of Eijroprilan Co ~n cjl D ire cU ve $ h a$ b ee n ramo/ved. . .

IS O 1:9 19A!llllnghlsreservedl,U:i1IS5;$OlMMJ~e ,~pecim~d,00 lpart O il this plItl licaloo may 1Meeproduoedo r utilized In anyf.arm or by any mean $ , e J le c. 1r 01m io r r ne oh an ilia l, iM IU di!'l9 p tlO to c0 P) 'iifiQ a ndml~r(}1iln1l,W~~li'iou~e rl !l f! i$ JS !Q [ l i i! ii lwri~ing trolill~lhe p~blisher.

rntemalional Organizaroiomlro ~Sianclardl;:a.lionC:;I$$~t

P,nn~ inSvliitz.etland

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elsa iso 1461~1999(E)

ContentsPage

1 Sco,e 'n '.., , , , ,..,,,.,..,,, , , , ,,, ,,,.,..,,,.,..,,,., , , ,..,.., , , , , ,.., ,..,.., ,..,.., ",.J2 . NOirILluItbi 'e rcfe:I'enCle~ ",."." ,.. ",.",., ",.,.., ", "" ~ :~3 Tenn(s} and del~l:Illiom!(s) " , , , , , , , ~" Gelle:r:aJircq U i~ rem cnts " " " " " " ".." " ".." " ~ L" ,, 34. :Hi]lt dip g:~]vanirl:ing bath " " " " " " 34.:2 l !l lfG ICI iI l .i I ti lon to b e s up pU e d by flu~ !p ," r~ ll.a$c r ,.., ~ ,.3,11 ,.3Sh 'lfety " " " " ".." " " " 35 . 8aD .Jpl:ing " " " " 36 C ! I! !; a ti ;n g [p! 'Fo ,ert ies .~.,~.~,~."'''. ' ' '. ' ' 'r...,i r.~..,ii+.r.~+.~+.r.~+.ii+~~+.i+~~+.ii+.+.~+.~*~+~++.~+~~+.~~.~~+~~+.~+~~+~++~o!!+~~+~++~+!+~~+~+~~+~+~~+!+.*!+~~+~+!!-";~+~~+!*~+~+~~+!+~~+~+~~+.+~~+!+.~+~+~+~+~~+~+~ 36 .1 AIP,pea,fall.ce " " " 3t i . 1 : l'hiickness " 4' 2,.:1. 'Ge:n,ier:a:I.,~.~,~iI"'iI.,.,iI~.~i~,,,i..,iI~..,i,.,.,~+.i+.~~+.~+.~~+.~+~~-t;~+~~+.~+ti~+~+~~+~+~~+~~+.!+~~+.~~+~+~~+!+~!+!'!-+~+~~!+~~+~+~++!+!~+~+~~.+.~~+.+~~.~.+~+~.+~+~.+~~+.~~+!~~+.'!-!'~.a;~'!-+~+.+~~+~+~+~~+!+!~!+!,6~2:.2:'~sttncth!lld ls , " " " 4,6+1 3 Reference a: I~~~:s' .L~.~L L ' ~I , ~, : ~,.~,~. . r . .~ ,r . . " ' .~ r ...,r.~r.."iI~"i "i..,i" ."iI~" i~r.i..,~~..,i"r.~..,i"r.ii+.i-r.r.,.+.i+.r.~..,i+.r.~+.i+.r.ii-r.i..,ii" "~' r.i+.i+.~ii+.i+.iii+.i*i+.~,...,i,..."*~' ~~+.ii+r.,,...,ii+~,r~~..,i+.i"ii..,."r.ii..,i 46 r . 3 , R , e o ! ! ) " ! ! , a ' i i r O : n l . ., iI~ ,r .i ,. .~ i+.i i~+. i""~ ii "~~+.~+.~ ii+.~~+.~+.~~.~~+~+~~+!~+~+!!! !+.~+.+~~+.+~~+~~.~.~+~+.~ '! .+ +.~j+.+g.+.~;~.+.;a;+.+ + ~+ j.~ , "".~,~.+ +.~,~.,~.+.~,~..,;.~;.~


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1$01451 :1999(E) ISO

Foreword

Thetext o f EN ]:80 1461; 199'91135 been prepared by T e ch nic al Co m m itje e C EN /T C 262 "M e ra lli c a nd other inorganicco atings" , th e se cre tar iat o f'w hich is held by BSI . in c olla bo ratio n w ith Technical Committee Tsorrc J!l7 " Me tallic an d otherinorganic coatings".T h is E ur o pe an Standard sh al I begiven th e s tatus o f a natio nal standard, either by publleatio a o f an id en tic a I~ ex t or' bye ndc rse m en t, at th e latc s~ :by A u gu -s tI 99 9. a nd c o nt li ct i:n g national s tan dar ds sh all be w itlldm w ill at th e latest by A ugust 1 999.According to the C. "'N/CENELEC Internal Regulations, the nalional standards organizations of'the fbllo\villg countries arebound to implementthis European Standard; Austria, Belgium, Czech Republic, Denmark, Finland, France .G er m an y , Greece,[cclan(J, Ireland, HaI)' , Luxembourg , Neiherlands, N ( ]! rway , Portugal, S P < l i u - . , Sweden , Switzerland and! th e U ruled Kingdom.

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e iso

I ScopeT his S tan dar d s pe cifie s t he gene . r

3 . 2~~t dip galv:3Jlllzed eOliIltl.ng, eoomn .gob ta ined by hot di p galva!niz~[IgNOTE Ue (emil 'hot dii,pgalvanized. ooalung'.i~ s ll o oe q jl le n dy n ~ Jew~d t o ~ s~ " h e 'OO .3 I: Ln .g i.

1


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IIISO

3.3, l ; 1 o i l i l H l t g IlHISSi ! O t ! J i i mass ofz;~ltc IIltd/or zil'lC'UffillJ lIIU oy s p erarea o f s m f a m : (c::;;:pres~edullJ gm rn :s p er S ~ I J 8 i t t m,e,u:e, gI:uttl)J o 4C~lIi l~!rug: thIID~k!!l '~1'i~~)0tlll~t ln .u c kn~ s o r zu [l t: !:IllJdior zinc-ircn 3]~IQ'YScxp; rr ,essedl i n m icmnse tr es , ~m)l,3 . 5s ig!! lj fi (! ! !J ! !l t sur f< 'i lc~~lhepart O F th e ~rI:ut:leeovsred or lo be: ro,v'eredi by the , D O a . t i: r n : g IIl:1difo[wEri~c:In, the c O l 1 l t i : n l ; g u s , ,~sscrutUlll~,~Q:rc : r v ] C l e 8 J b < i I i ~ . y lind/or: a p p e a r ' d I l J C l C

3.6.'OOl!!l~n:l~SIlI!l!IpJ~U ! i C~~tide orgro!up ofarticles f ro m a I .c a tt h a :i : is 8 e ie c l ~ d f o . r t e s h :n g:un:lie!)'\!)1~cearea'~il iIe!lttl:!' willl il irn. w~idla Si;pec~:fi lcrnlumlber( i j , f s : i n g ~ e me;a;S!u[e.mern:rs 3 S , I D be mildl~3,.8h l i l i ; : a r u 1il1li'lIrti!rn!g!hklknle5St l l i C m eaa W bl'C (If e O M i rn g t h i ek n e s s {)!btl lbrlcdi f m m l t .l ( ; s pe c if i. ed r lt o ob ev OfmeflSl:Irtme:i !Ji ts w ~ t h . ] [ 1 11refereace iI[eil f o r a ml lgnc ti .c :te st o .r t he single value from . ngmvtme1r . ic l cs t3.9m e : : l J 1 :l ie 0 l lJ t ii n g U i iJ ~ c k I l1 J ~ , St h ea "' "e ~xage ,v al ue o f t h e l o c a l i h i c k n e s s e s eid'iie'J'0 1 1 1 one I . u g e ; a l ' i ! k l e O f 'o:t l a n dle,Uililcle.s l m l i l i l , e , ' O n t r ' O l sllrnpk3 . ~ ( 1 1~oca~tl~Umg m~ss~hevalue o f COll lt ing mass Qbbined from a s~nglegraviJrletrijCW


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'IISO ISO 1461!1999(E)

4 Genend requirementsNOTE 1 . Thechemical composit~o!l and tile surface condition (f~nislIor r01~gimc$s)oflh.ebasj;s meta!, the mass oftlle parts and theg a l " ' O l ! I ~ i > ! . u n sconditions affect the IIppearance, th e thickness, th e t e x r u r e and physical/m~liIal l ica:1 properties offhe c o a t i n g _ .T h is S m n d9 Jfd does n o r d efi ne a ll), r eq uir em e nt n ::g fu ttli ng :these poin t s , bul:gives so m e recorameadanons in lmni:')l C,

. . '. . . INOTE '2 EN [SO 147] 3 gives guidance on the selection of ro t dip giLl'; ilili2ed coatlngs for iron and steel, N rSOI29445 - includesi .nformlltiQIlon paint cOiI t: ings() 've~hot dip galvanized sled co~4ings.4..1 Hot dip galvanizililg bathTh e hOI dip ga. lv! '! ll lz1ngbath slilall primarily conta in molten z inc- Tke to tal o f impurities (o the r than i ron an d tin ) in the mo h e nzinc sh a ll no t exc -eed 1 .5% by m ass, th e said impuri t ies be in g th o se de fin ed in ~so52 o r EN I.]79 . (S e e als o a nn ex C,)4.2 lufon:nation to be supplied by the pl!I.[-eha:scrT h e In fo rm a tio n lis te d in an ne x. A shall b e s upp li ed by th e purchaser.

Ve ntin g an d d rain in g s hall b e p ro vid ed for illa c co r d an c ewl jh ! I[ l! l, e, x_

A c on tr ol st ' l :mp~e o r t h ic kn e ss t es ti ng shan b e t ak en ! fI. nd om ly f rom e ac h ' ~l' ls pe ct io nlo t (s ee 3 -Ll) s ele ct ed f ar t es ti ng . Th em in im um n um ber o f an kles fro m each in spec tio n lo t th at fo rm s the con t ro l sample shall be in ac co rd an ce w itllla b le I.

4to SOOA ll

:;.10000 20

Numbe r liIf'adic_]es ..in tbe Jo t Mh dmu lill n um b.e r o f arUdes in Ihecool["ol sample

5IH to 120012m to3200

Ae0C]: iUl incenspec t ion sball be undertakenbefere the products leave the hot d ip g alW l ui xr 's c us to d y , unless otherwise specifiedat. the t ime of (uiler]llg by th e purchaser.

6.1 AppearanoeA t a cc ep tan ce ills pe cn o ll. th e s ig nifi.c an t s ur fac er s) o fall th e h o t d ip g:a.Fvanizedarl:icie{s), w h en e xam i ne d by n o rm a l e o rr ee te dvis ion , shall b e fr ee fr om n cd ule s, b lis te rs (i.e ., r ais ed a re as w ith o ut soli.dmt~1be:nC'ii:Ih).roughness an d s h ar p p oi nt s (if theyc an c au se injury) and unco ated areas. - -Ni01~ :1 'Roug'hness" ilnd 'smoetheese' !!reelative terms l I'U1d' Ihe roughness of coatings on iltrtjele.s gal~nized after fabrication. diffe:r;s.rommechanically wiped products, sceh as IilU~\i'M.nz:edsheet and wire.

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OISO

The OCCUIT"Z:ffilCCof darker or lighter grey areas (e_g_a cellular pattern of daek grey Illleas) - a u : some surfaee unevennes s sh~U notbe a cause f o rr e Je c li o n ; a ~ s .owe t storage stain (w h ite o r dark co r r o s i on pTOOUC~ - p 'l" in lllr ~ ly bas ic -zin c o xide ~ fo rm e d du rin gs:rllfageil 'l ~'1tLmjdc o n 'U : ll o n s. i n er h o t d ip gal v a n iz in g ) shall not be cause forrej ection, providing the c o a li n g t h uckn es s remeinsabo ve th e s pe cifie d m in im um v alue .NOH 2flu x r es id ue s s ha lt :tlO~be p er m iu ed , L um p s an d zln e ash sh all n ot be pe rm itte d w he re th ey m ay affe ct !tie in te nde d us c ofufch o t d ip galvilni~d a rt ic le o r i ts c o rr o si on resistance requirement

Wh e n part icular r eq~hem.e r . i i 1 S exi s t (for example , when t h e gfl~v8nized cOfu:ing is tobe pa:inl;ed), a ssmple s ih : i lHbe produced(see A.2 and C. ~A) ihequired-6:2 Thickness

Coa:t ings or~ : ion .a lo the coat ingth ic kn es s, F Q r ~'!1hemdy aggre{l. s i '! . leondi r lons and/or a ll eX icept~onaUy lo n g s er vic e li fe , t hi ck :e r ,ooatimgsman th .os.especifiedhere;ltUlY be r equ i red .The ; s p e c . i H c a t i . o J : ' l oftlese t h i cker e o a r i n g s shal l be S l L i Y j c c t t o a gr e emen t between th e galvanjzer a nd t h c ] lu rc . h as e r c (] ln c cm~ngf h emean s o f i rjl pl e~n e n ta tLQn( e, g . . gr 1 tblasting. s t e e l. ch em i ca l comp ( ) si ti on ).

[ I J J C11se of di~ pt~ lOCc;g ard ling the test method, the me t h od of calcl1~.ahng~ille coalillg thickness sh


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d) Fo r !Irticl~ with less thaD .1 00 0 mm ~ significa:tU surface ilrtil: E no n gh a rtic le s & h a Ube ,grol~ped t o g > e ! h e r 1 :0 provide al least~.000 IJ!Inl sillrfi!lt:~folf 3!l1 indlv~!diUil l re ference area. Thenumbes of :ref.e'r'elllce areas s :hal l be as g ive ' ll i l l th e bst CQhnU fL o f~ abk .~H cn ee , tib:etotainiUlrnlber o f :f'Li1k:l.es teseed e qu als th e Il iumbe, o f 3 r t i d e s reqjU!i~edl~o, ] )'wv ide one , r e f e rence area~rmh i : pHe~]y dle 3 J p p r o p r ] < ! I t e rJi~~ _ j l > e rfro m th e las~ o o ; ~ u l l m oflab~el ~'CI::Hedi to the s i ze oF~ i li Ie~~ n{o [~ h e l ;o ~ : 3J II 1 J! !l !mb e r o fa ~ i . c : . ~ e s ,ga h l < i . i 1 Iz _ e ~ ~ flh at :~ s J e 1 l S J . .A kern l:1rE :a lilin gsis b ~w er lhan the: values 1 1 1tables 2a.lld 3, th is is [f[~lclIl!lt as ol l !:y~be mean\i'3.hle,00lI'ertlile whol e of eaehrefesence .rnma.is mqui:r'll


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ISO " 11 4 \ 6 1 :1999(E)

urn

,fIISO

~ 6 m m to -.:;:20 mm d iam e te r

LDe ' l1 cOl ld l1 lg t lr l~c lmes. l l(mirnimum)3

Me'alil C@;lUtig tb jc~ llJess(mirnim~I~)b

45 5335 4520 25

OU]je~ ! !J r tide s (~!~c~Uldjngcilstililgli):

35 45a See 3_8 .b See 3_9_

N01J]~3 Table 3 i~lor general use; :f21srene


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ISO ISO 1 4 6 1 ; 1 9 99 ('1 :;)

Adffilcs ion bCI:wC! l :TI zin c an d basis m etal gen en tU y does. no t need to be I ~s li ed . '! ISa t leq l~a te bond ing is charactefis~c o f t he ,gfllvanhing pro cess an d th e COM:OO.ork should be ablew w ith stand - w ith om peelin ,g, o r flaking: - h nndH n,g cons is tent withth e I1fI:IU[{l find th ic kn es s o f th e c oatin g an d th e n orm alu se oflhe aruele , [1 1 g en e ra l, tb ie ke r , m ali ng s r eq ui re , m o r e c n re fu l.handHngthan iliilllle;r coat ings- Be~ru ' lmgor fo rrn ingaf i :e r iJo t dip galv.an~zing ar e ne t considered to benormel handhng.Should Hbe necessaryto reSlthe adhesion, e_g_ in the case afwmkp'[eces that are to be subjected to high mechanicel stresses,any tes t t ;~udl o n ly b e em s i gn ifi ca n t surfilC.es, L"C,i n ar ea s il l which good adhesion i s impor tant fo r th e proposed applicali9n.A crcss-hateh testwill give som e guidance 011 the mechanical preperties o f' th e c om in g burin some c ase s [n ay be moredemanding than. th.eapplicatioa re qu ire s, O th ef imp i ngemen t tests an d C I , I U i n _ g testsmay also be developed [01' ho~dipg~lvaniLied coOltillg5


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ISO

Annex. A(normative)In'formati.on to be supplted by the purchaser to the hot dip galvanizer

A.1Essential informatimlT he n um b er a fllti s 5 tlfln d.:ar d,i.e, EN IS O ~ 4 61 j shan be supphed by the purehas e r to the h ot dip galva:llizer.A.l Additional i .n.[orm,atiol l l .T h e fo n ow in g infosmation m ay be required fu r p{l[I:iouI8[ purposes and, if'so, shall be supiP~.iedor specified" as applicable, bylh e PIJl~'cha8er.Th e gal van ize r sh all o n re que st ~ m ;lV idean y r e levan ; infmm.Oltioll available to h im i n clud ir lg t h e m eth o d o f re n cvatio n o funeoa ted Qreas. .a) T he c ~ !n po sitiO in a n d < ln ypr ope rtie s o Ctile ba sis me~a l (s ee a nn e x qtha:Imay f :IIffec;~hot.ip galvaniaing;b) an i de n tl fi ca ti on o f s ig ui H ca n. t sl,l~'fuce8,.[ 'Orexamele by drawil1:gsor by the provi s ion o f s 1 i l~ t a ,b ~ma rk ed samples;c) 11 d m w : i n g o r o th er means ofide~nti.fyi:ng wnenl sarface Ilnevel1n;f'S~,fo r e;o::

t ile coaled 8rt~cle llnaooeptabl.c for i t s in tei ! ldedpurposc; tffilepurchaser shalldiscuss with the gal 'llani zer l i h e w1!lYo~1with such t)!,Qblerns~d) a sample or other means QhhQwing (he, required fi l1 ish~c) any special pretreatnrent requirements;f) an y s pe cin l ih ie kn ess o J coa t ing ( f i O C 6 .2J, n o~ :es2 an d 3 to ~i231 I ! J : I l J iI n n e x C;g) th e n ee d for, or rue nccepmbiHty o f, aoon~nftlg;oo MM:ing tliiill. 't:isllOmeet thereqll~rcm'Crnts o f tRb~e 3in s ,t e ad of table 2;II) any after-U-eattuenlS or overcoat i l1;gwbe given to tll.e gatvtlnized.w.:Mlng {see 63,. Cil find C:5);i) inspection arrangements (see clause 5);j) whe t h e r a certificate of compliance is required! inaccordance with ISO I0474.

8.


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@!ISO ISO 1461: 1999(E)1

Annex B(normative)Safety and process requlremems

In th e ab se nc e o f n atio n al s afe ty a nd h e alth r eg ula tio n s c ov er in g venting a nd d ra in in g o f c av itie s, th e p ur ch as er s h aH p ro vid em e an s fo r h an dlin g th e w or k an d h o le s o r o th er m e an s fo r ve ntin g an d d rain in g e nc lo se d c av itie s 01 ; give c on se nt fo r th eg alv an iz er to p ro vid e s uc h v en rs a nd d rain s. T h es e ar e, e ss en tial fo r b oth s afe ty an d p re ce ss r ea so n s,WA:RNING ] t~s , essc:ntLai to avo id e n c lo s e d c a vi ti es l ! I ;S th e se c an c au se e xp lo sio n s dlu:ring hoI; d ip gal va ni zi ng ,NOTE


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ISO 1461 :1999(E) 01.80

Annex C(informative)Properties of the articles 10 be coated that affeet the results ef hot dlp ga.lvani.z:ing

C.1 Basis metalC.I.I CompositionU nallo ye d c arbo n s te el, lo w-allo y steels ~ nd grey and m alleable cas t iro n are in gen e ral SI!J:utab~en)r h ot dip galvan izln g. W h ereo t h e r ferrous metals are to be g alv an iz ed , ad eq ua te informerioa or samples sh ould be provided by the pl!Jl \chas .erfO'r th eg:llvailize:r to de cide w he th er th ese s te els can b e 8 at is fa ct or i~ y ga iv an :i ze d, S u lfu f- co n ~ am i n g: fr ee ~ clll it in g s te el s a rc n o rm a llyunsuitable,C.l.2 Surface conditionTh e sur fac e o fth c bas is m etal sh ould be c le an be fo re dipping in to t.lle m o lten z in c , P :i ckUng lnacidis l : l i i c re co m men ded m eth odo f clean ing th e surfac e. Excess i ve pic kling sh ould be avoided. S u rfa ce c c nt am i ae n ts t ha t c alm o t be r em o ve d by pickling. e.g ,ca rbon fi lm s (s uc h as r ollin g o il res idues) , o i], gr eas e, pain t, welding slag ana simila:rurnpur~ti,es s hou ld be e em o ve d pr io r topi .ckli :ng_The resp0nsibil.ity for r emova l of suc him pn ritie s sh ould be agreed lJi.etWCCIIiI. tlile g1l1vall i l . lzerand the purchaser,Cas~i:ngs should be as free as possible from surface porosity and sltr~111:ageholes an d should be c lean ed by grit btastli'ig.electrolytic pIckli!'lg o r by o t h e r methods spee.iilHy suitable far cas t ings ,C.l.3 The inRuence of steel surface roughne!)~ ( 1 1 ( 1 , the hot dip 'g~l''1anm:d coating thieknessThe surface roughness of the s t ee l surface has an influence on thejhickness and the structure of th e coating. The effect ofsurface un even ness o f'th e bas is m etal ge ne rally rem ain s vis ible after galvaniz ing,A rough s te e l sur face as o btain edby gr it blas tin g, c o ars e gri.m:ling,el:C., p rle r t o i )~ d kJ illg g iv e's alhicker coa r ing th an a surfacethat is o bta in ed h y pic kl~ n g alone,Flame-cuui:i ' ig ch an ges th e s te el c om po sitio n an d s truc ture if l th e t iam e -c u l Z { )[ Ie , so tha t th e c oo dn ,g lh icknesses given in 6,2.and tables 2 and 3. < Irem ore difficult to obr,a:tn. btl o rde r to obtain tT rl e se c o at in g t h i ck n e s se s reliably, flam e c ut sur faces sh ouldbe gro un d o ff by th e fabricato r.C.l.4 The innueHce of reactive elelnents ill the basis metal on.the zinc coaling thickness and appear:aHceMost steers can be s at is fac to rily b ot di p galvanized. However, several reactive elenlelJJts in th e s te el canaffect h ot dipgalvanizing, fo r e x!!I1 !I,le " s ili co n (S i) a nd phospho rus (P}, The steel surface composition h as an in fluence o n th e thickness an dappearance o f the z iI lc c o a ti n g , A t cer tain co mpo sitio n leve ls , s ilic on find phosphorus , C an g iv e uneven, bright and/or dull darkgrey coatings, which may be brittle and ~hick,Frellcih Sta:llilaro NF A3:5-5 0.3:] 994 g iv es , s ome guidance 01:1 behaviour and ons teels p os sib ly s ni l'a bJ .e fu r hot d ip ga~ .v a l! li z in g bu t reSe '3l 'd l on t h e i n tl u. eu c e (If s pe elflc e le m en ts tn . th e S le ets iss till in prog res s(see also EN IS O 1471 3).C.1.S Stresses in the basis metalSome S'!rCSSCs in th e basis m e tal w ill be re lieved dur in g th e h ot dip galvan izin g pro cess and th is may c ause defo rm atio n o f th ecoated,art icle .S t e e l articles tha , t ar e cold worked. '< e.g, bent) may become embrittled, dependrng on the type of s t ee l ~mdlhe degree o f co ldwork. A s hot d ip ga lv a n iz i n g is a form of heat tre.atffieiri,t, it mayaccelerate the onset of strain age embrittlemenl ifthe' steel isalre ady susc eptib le , T Ooavo id r isk o f embrinlemetlJt , a steel. wfueh is noli s us ce ptib le to slmi:ll. age-hardening c an beused, If astce~is th ough t to be s~ lible to s tra in age e-mbri~tlem,er.JJt,avo id se ve re c old w or k ]f~ i.b .~ e_ ~fsevere c o ld wo rk cann o t beavo ide d, s tr ess sh ould be re lie ve d by h ea!-tt,e atm e nt be fo te pic kH ng an d ~O'~ di p g a i . v 8 f . 1 i z i F l g .

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ISO 141611:.19 r99(E)

N(r[E SllilicepHlbiUtyo st rnun~;ge.hardening mldl~he censequea t r i sk afemll:!rLItIe.men!t is pri l lcipaUy can1loo by me n iao geu co n ren t ol.f' !111~~.te~'~,W'hidl , ~fJ!!!,Irn,.il~~~.irgelyependent 0[ '1 tbe steelmaking. p ro oe s~ , .A s 11 ,gene.ra~ g' IJJide,h e p ro ble m . d oe s n '!J ~OOCUIT ~n lI:lOdem.~i~hln'lkii'lgf~~~i(le,- A~lL1mli'l~~~"lkmed!~eei s .~if'e t h e ;~e{ jj s t $ 'Ujs i J) ep tub~e0 s l rn~n a:ge4mro:enin:g.Heartsea ted 0\1' cold wOEked sleds m ay be t empered b y ~ h e h e -. a~ill tlh e 1 1 0t d . u p :gal.".aa)~.t:ing bath and IQSeSQfJi le o f an i)' ~nc:rea~ei !11stfe:lilgl,h.,obtll! ln.edO r y b.eat ~reo~'k;imlg_Hardened andforffi ligh lensule steels may CQn:I:3~1JJinterna I stre sseso f such f~lti.agnhudle tha~ p.~dd:ing and h o t dip galv3nlztng mayincrease tbe risk of cmcking oHlhe s~:e:iitl the hot dip ga~valJJi:z:ingbfLlh,The risk of cracking may be reduced by st ress relievingbefore p~.c,kling an.tlhot diopgalvanizing,.liJut special ist advice sh ould be SOl \ght wh e a . .h o t dipga.tvaniz~ng such steels,S tn l c tu ;m~ . s te els a re no t m lQ nn .ln yemlbriul.ed byl.he,oIboorpMon o f hyd rogen . rc l: l! I~ 'i lng) iCk~i f!g .a li ldhyd l rQg;en. re lna i ln l il li l.g (~ .hny) ,do es n ot in gelliernl a f f e c t Sin'ucu.na~steels- W~l ib st roch!ral s t e e l s , abs or be d h y dr og en i~dn .~cha rged O : t J l I l i n g[hOI dipgll . lV'anizing.If slee~sare liIa!)de:rthan. a !ppl'ox i.m:ue ly 34 REte, . 340 HV or 32:5RB (soe: 1804964) , care is ]JCCt;5.saJry 10 mi.UI.lmizt hydrogen labsorbtion dtIrilJJg surface prnpiJiratruoilil"W here expe r ien ce sh ows th .lt s p ec ifLc s t ee ls , p re t l' e< ! l.men ls , l ii ]e rma l an d mechan i ca l heatmenls,.pickling and h o t dipga lv . an~z in ;g pmoC~-d~ure -save been satisfac~cH:y. th e i l1fOfrnahQn se rves a s an lndieetion that an . crnbrittlc:rncnl problem is md tobe ~ r e c l e > c l fo r tbe ~ame c - Q m b i ! I l . 3 : t i Q . _ ~ ,of steels, [ ; I [CW~:!!! lmen~s: . .h(1;rma.~an d mecnan i :t :: 1l ll reaJ ttne ll ts 31 :i ;~ . ga .l .v a ll ~zim lg p roCed ilHeS . .

Lon_ge~ ha rn ;d . ]i og ~~rn~~a re n ee di ed i[l U te ga l. va ru iz ilJJ g ba:l:l!Jforia[ge articles and ~l:uis,aswell 3$ b~m.C:MI~IIl I~gi~] FiJJ.lClperlies of~!hiick ~,~ee~;s d l u : e ~ Q n . o r . m a & m:il!J]l.IfaclJuri[Jgm.e,uil!0ds., m : a y c au se l l i i ! t k . c 'Q H t i'n g s '1 0 : O O F l l ! l l "

Vel} ' sm1l!UaJI lJlOUlH.tS) o f 1I.~!liJ.y~:n:g .~em(lWitsmay lbtladrll.ldi to t n . c g; :t~va;nZ i l :n :gi JQth(s1 l lIJ jec :~w t il1e "eq:IJ~f\emelil:ts of 4 , l ) as part ofl:liIeproees&i[JJg l : C < : , l i i n k r u e ofg1 1 1 1


16/20

ISO

C.3 The hot dip galvanizing bathW h ere tlh e,r t is a special r eq uir em e n t, le ve ls o f a dd itio n s o rim p ur itie s in th e bath o r in th e co atin g m ay be spec ified by tl ll epur c has e r .Inpar tic ular .w h er e bo ile rs (i.e . tan ks an d cy] indcrs) ar e bo t di p galvanized a n d s p ec i fi e d for us e with h o t dipgalvan ized tube s in potable w ate r sy stem s, th e purch ase r m ay req uire th at th eir c o atin g eo nfe rm s to th e sam eco m po sitio nal req uire me nts as fo r: tllbe in E N 1 024 0.C.4 After-treatmeetN o rm a lly ar tic le s SbOll .M [101 D e stacked together wh ile bo t o r wet Sm a .U a r ti c le s dipped in b ulk in baskets (lU' (In j igs m ay bec en tr lfug ed h ru ne diate ly .a fte r w : u t h d r l :1 . W 3 1 fro m th e zinc to r e m o v e an y surplus m etal { se e A.2, g)).To retardthe possible f O r : J T h 1 ! l i o t l of w e t storage slain O'fl~l'Iesurface, articles th at ar e not to bepainted can be given 8 suitablesurface I:realmcnlt after ho t d i p g :a ll ,l an i ~ i ng,If the anicles ar e to b e p ai nt ed Or powder coated afte r g alv an izin g, tile [(111l'cilll lSer should inform th e galvan ize r be fo re th e articleis galvanized.C.S Renovation ofU1n~oa t ed or' damaged. areas\Vhere: the bJo;1dip g.a lvan izer i advised that lIil o ve rc catin g is to be specified, th e purchaser sh ould be in fo rm e d t ha t r epair o fdamaged a re a s. i s Ji~:imit.~d and! informed. about th e p ro po s ed m e th o ds an d m a te ria ls used! (or m:pa:irof uncoa ted ! o r d am a g eda r eas , Pu r cha se r s . an r l appHcfl llOrso f subsequen t coatings should as su re th e m se lv es th at such 8. subsequent coating sys t em isco:mpatib~e with fhe mel:hods and malle ' r ia ls used ..6 .3 c o ve r s tile t h ic kn e ss o f coa t ing r e qui re - d b y th e r e nQva tiO 'nprocedure at . acceptance in spec t ion , Th e sam e t ech 1 1 iques ar eused for on-s i te repairs to damaged areas, The s ize o f areas acceptable tortreatment should be s imilar to those aceeprable fo runcoated areas,

C'.6 AdhesiontestingA ny proposed test should be agreed a nd r el at ed to t h e li ke ly c o n st ra in ts ~:iii.se rv ice .

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@ISO

AnnexD(informative)Determination of thiekaess

n.r GeneralThe most general uen-dastractive method OFdetl.::r.mirni[lg t~ickne;ss iathe magnetic method (see 6.2 and EN [SO 21'E}. Olhc[m eth ods m ay h oweve r be used (see , fo r exam ple , [S O 280 8, th e e ie c :~ o'.m


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Table D .:2 - C{laU ng min imum. masse s ( rcL i lt ,e ( It o th1clkii lJeS5'es) o n s am p le s th at are c en tr i:fuge d II

J . I l I U

0 ;: 20 mm d i ame l e r

. ::6 rom diamel:ci[

325 4 5 395 5525 0 35 325 45145 20 180 . , ~_;)

Utber:u~:ichHi OllidilJldingcast1llilglii):~3mm


19/20

ISO 1461 :1999(El

AnaexE(informative)BibUogra'pJiy

EN1S0!463: 19 '94, Mewllicand o)l.idecoathtgs -M:ea,~!IFment of coaling thickness - Microscopical method(ISO 14'63."198 '2) .EN ISO 21 77: l 994, Metcrllic coatings - MeaSllr-ement o f caafhrg thlchwss - C()~llometric method bJ ' a nod i c: difi~oluti()n(ISO '21771985).ISO 2808: 1997., Paints and vornishe - [ie(:ermim:uioH ofjUm thickness.[SO 4964: 1984, Steel> Hardness conversiom.EN l S O .1 294 4-4 , Paints tmdll(lmisnes - Conmi(mprotection ofsteel8trucmres by protecll}le paint system.~- Pt.m 4 : Type..~Q fs r,n fa ce am i .s wj i lc e preparation (ISO 129444:' J998JE .N ISO 12944~5. Pail'lL!; a nd v (lm f Nh es - C o r-rO Jia n p ro te ctio n o f s te el ~ tn jC /'U J"e y pl1)tec:tive p.:.!im sysfems - P an 5.-Proteciive paInt s y st ems ( ISO 12944- 5, 1998 ).EN ]SO .1 4j' .13 , Protection against corrosion oIir-on and sted in structures - Zinc and (liumjni~ml coatings- Gl,lidelines(ISO 14'113: 1999).E N . 10 2 4 0 Int l lwnal andim' external proU:ctiw;) c{)a.Ung,~for steelli'lbes - Specifica.tio.n for n m dip go.lj,lGl1izedL"Om.ings appliedil1 amomatic picmlN.

NF A3 5-503: 1994, iran and ste.el- Ste.elfor hor dip ga/lianizing,

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ISO 1461~1999(E) @ISO

le t s 25.22.0.40Price based 01'1 15 pages

international standard - galvanizaÇÃo

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