Investigation of electrolysis corrosion on marine propellers

腐蚀 电解 材料科学 海洋工程 环境科学 冶金 物理 工程类 电极 量子力学 电解质
作者
Annie Wang,Karnika De Silva,Mark I. Jones,Wei Gao
出处
期刊:Modern Physics Letters B [World Scientific]
卷期号:39 (06)
标识
DOI:10.1142/s0217984924420119
摘要

Marine propellers operate under severe service conditions and experience various corrosion forms. Electrochemical, mechanical, and biological corrosion are the three main common types of corrosion that occur on marine propellers. Electrolysis (electrolytic corrosion), being one of the electrochemical corrosion forms, has been extensively observed on marine propellers. It is the forced introduction of an external current in metals when submerged in seawater. However, it has rarely been studied for marine propellers, mostly on underground pipelines. This paper investigates the effect of electrolysis on a chromium-containing coating on copper substrate by studying the surface and cross-sectional microstructure of the substrate. It is likely that cathodic disbondment caused by high alkalinity and hydrogen evolution at the defect location were the primary reasons contributing to the failure of the coating, and the silver-colored layer deposition around the delaminated area is the corrosion product of copper–chromium oxide. The purpose of this study is to understand the electrolysis corrosion mechanism on Cu substrate and to develop a highly effective anticorrosion coating for marine propellers.
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