铬
材料科学
涂层
腐蚀
氧化物
氮化铬
聚乙烯醇缩丁醛
阴极保护
六价铬
冶金
转化膜
金属
复合材料
阳极
电极
图层(电子)
化学
氮化物
物理化学
作者
Natalie Wint,Daniel S. Warren,Arnoud C.A. deVooys,Hamilton McMurray
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2020-01-01
卷期号:167 (14): 141506-141506
被引量:5
标识
DOI:10.1149/1945-7111/abc360
摘要
This paper describes a systematic study into the role of chromium and chromium (III) oxide thickness in preventing corrosion driven coating disbondment of organically coated packaging steel. A graded wedge of chromium and chromium (III) oxide is applied to steel using physical vapour deposition (PVD). A polyvinyl butyral (PVB) overcoat is applied and corrosion is initiated from an artificial defect using NaCl. Scanning Kelvin probe (SKP) potentiometry is used to monitor coating delamination. Wedge thickness variation allows for high throughput investigations into the effect of both metallic chromium and chromium (III) oxide thickness, on coating disbondment rate. A linear reciprocal relationship is observed between chromium metal thickness and disbondment rate. Increasing chromium (III) oxide thickness (applied over chromium metal) results in a decrease in delamination rate. This work highlights the ability of PVD to produce chromium/chromium (III) oxide corrosion resistant coatings to use as alternatives to hexavalent chromium-based systems.
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