corrosion project presentation slides
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STUDENT INDUSTRIAL TRAINING (SIT)
CORROSION ENGINEERING (MCB 4423)
UTP CORROSION WEEK 2014
Project PresentationCorrosion Study of Outdoor Plant Hook
GROUP 5
GROUP MEMBERS
OUTLINE
Corrosion has been a major issue affecting public infrastructure.This includes almost all structures, including this outdoor plant hook situated at pocket D open garden, situated beside block 16 and 15 in UTP campus.
PROJECT BACKGROUND
PLANT HOOK SPECIMEN
Made of mild steelOriginally intended for cheap decoration substituteExposed towards open environment and weather changes, with a small man-made stream nearbySince it became dull and unappealing, it was removed from sight
PROBLEM STATEMENT
Corrosion of the hook makes it prone to break (at highest stress concentration at hook curve), which might leads to unwanted accident.Corrosion of the hook is not aesthetically appealing, hence denting the landscape of the campus area.No corrosion prevention eventually leads to the abandonment of the infrastructure.
OBJECTIVE
Past Corrosion IncidentsAmong the highlighted case was in 1985, where a concrete roof of a swimming pool collapsed only after thirteen years of lifetime, killing 12 innocent lives. Post analysis by the federal materials testing institute, based in duebendorf, switzerland, and the federal materials research and testing institute of berlin concluded that the collapse was the result of chloride induced stress corrosion cracking (scc)[2].
LITERATURE REVIEW
9th May 1985, the concrete roof of public swimming pool collapse only after 13 years of lifetime. 12 people got killed and 19 were injured.
LITERATURE REVIEW
The steel rods had been pitted, causing the roof to cave in.The collapse was result of stress-corrosion cracking.
LITERATURE REVIEW
LITERATURE REVIEW
The Uster incident can be avoided by:METHODOLOGY
SAMPLE PREPARATIONSOLUTION PREPARATIONWEIGHT LOST METHODLINEAR POLARIZATION METHODEXPERIMENTAL SETUPELECTROCHEMICAL MEASUREMENTELECTROCHEMICAL TESTCLEANING AND WEIGHT MEASUREMENTRATE OF CORROSIONOBTAIN SAMPLE
METHODOLOGY
Linear Polarization (LPR) Method
RESULT AND DISCUSSION
At the beginning, the rate decrease drastically and slightly uneven after 3 hours. Final corrosion rate of specimen in rainwater is 0.13 mm/yr, in NaCl is 0.16mm/yrThe graph shows the result of corrosion rate of NaCl and rain water within 24 hours.
Weight Loss Method
RESULT AND DISCUSSION
In each medium, the experiment is repeated with specimen B and D for validation purpose.Cleaning cycles is repeated in order to obtain constant final weight.
Table 2: Percentage of weight loss for each specimen Table 1: Results of final weight after 336 hoursWeight Loss Method
RESULT AND DISCUSSION
Weight Loss Method
The corrosion rate of the specimens immersed in NaCl is higher than in rainwater.The pH of NaCl is lower compared to the pH of rainwater.The availability of hydrogen ions to react with electrons at cathode also may influenced the rate of corrosion.
RESULT AND DISCUSSION
17CONCLUSION
The specimen is assessed by conducting Weight Loss Method and LPR Method.The NaCl solution acts as baseline while rainwater as actual medium.In both tests, the corrosion rate of the specimen in baseline is higher that in rainwater.The difference of effects in both condition is small and not very significant.The slight difference might due to the simplicity of the measurement offered by the weight loss method and thus may have slight error.
Experiment Accuracy:Make sure LPR technique is perform in relatively clean aqueous solutionsNo water/oil emulsion in the solution to prevent fouling of the electrodesCorrosion Mitigation:Apply coating layer or galvanizationCorrosion Prevention:Substitute plant hook material with a better alternative (e.g. Iron)RECOMMENDATION
Q&A
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