Pitting corrosion behaviour and mechanism on carbon steel induced by aluminium cations

Chang Yee-Shyi, Lin Jing-Chie

Research output: Contribution to journalArticlepeer-review

Abstract

A series of tests indicated that the corrosion of steel in a 3.5% NaCl solution could be effectively inhibited by aluminium ions. However, a detrimental side effect of pitting corrosion occurred in longer duration tests. As pits formed, hydrogen bubbles were found and regarded to be an important cathodic reaction apart from the normally considered oxygen reduction. Deaerated and oxygenated experiments were conducted to elucidate the effect of cathodic reactions. The pH values of bulk solution and interface were measured. The formation of a white gelatinous film and bubbles were observed in-situ through a stereomicroscope. EPMA and X-ray diffraction analysis were applied to show the morphology and composition as well as the phases of the corrosion product. The present paper deals mainly with this particular pitting corrosion behaviour induced by adding aluminium ions which are originally considered to be an inhibitor and proposes a tentative mechanism for the system based on various evidences. The significance of the behaviour and mechanism are also discussed.

Original languageEnglish
Pages (from-to)31-44
Number of pages14
JournalMaterials Chemistry and Physics
Volume16
Issue number1
DOIs
StatePublished - Jan 1987

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