Role of sulphate on corrosion inhibition of aluminium alloy in acidic environment / Norshamira Mazlan
Acid accelerates the corrosion process of aluminium. In this study, sulphate is used to study the corrosion inhibition on 5052 aluminium alloy surfaces. Sodium sulphate is added into different pH of acid solution. Concentrated sodium hydroxide was used to alter the pH of concentrated hydrochlo...
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| Format: | Thesis |
| Published: |
2022
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| Subjects: | |
| Online Access: | http://studentsrepo.um.edu.my/14314/1/NorShamira_Mazlan.jpg http://studentsrepo.um.edu.my/14314/3/shamira.pdf http://studentsrepo.um.edu.my/14314/ |
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| Summary: | Acid accelerates the corrosion process of aluminium. In this study, sulphate is used to
study the corrosion inhibition on 5052 aluminium alloy surfaces. Sodium sulphate is
added into different pH of acid solution. Concentrated sodium hydroxide was used to alter
the pH of concentrated hydrochloric acid to get the desired pH 2, pH 4 and pH 6. Distilled
water is used to prepare pH 7 to compare the behaviour of sulphate in acid and neutral
electrolytes. Potentiodynamic polarisation measurement was employed to evaluate the
electrochemical characteristics of the aluminium samples. While assessing the
performance of the inhibitors, the effect of inhibitor concentrations in the acidic and
neutral electrolytes are also to be studied. The corrosion rates of the aluminium samples
were reduced when sulphate inhibitor was added into the acidic electrolyte. It is found
that the corrosion density of aluminium samples was reduced with increasing inhibitor
concentration until 400 mg/L in all pH conditions and the maximum efficiency is
identified at pH 6 with 67.4% . From Tafel plots, sulphate acts as anodic-dominant
inhibitor in acidic environment. The corroded samples were analysed under optical
microscope for surface characterisation. The morphological images study on aluminium
alloy samples perceived that uniform corrosion happened on the aluminium surface with
slightly pitting on certain areas. |
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