田文明,田文庆,李忠磊,康会峰,程法嵩,李艳霞

• 1:北华航天工业学院材料工程学院
• 2:北华航天工业学院河北省跨气水介质飞行器重点实验室
• 3:青岛特殊钢铁有限公司工艺研究所
• 4:中国航发贵州黎阳航空动力有限公司工程技术部

摘要(Abstract)：

利用电感耦合等离子体发射光谱法(ICP-OES)及三维显微镜测定了304奥氏体不锈钢在不同极化电位下生成的单个三维稳态蚀孔内部的腐蚀产物浓度,同时,基于扩散控制理论,根据菲克第一定律计算了蚀孔内部腐蚀产物浓度的理论值,并观测和计算了蚀孔形貌及孔内点蚀电流密度,分析了蚀孔生长速度与孔内腐蚀产物浓度、极化电位、蚀孔几何形貌间的关系。结果表明:ICP-OES测得的304不锈钢单个蚀孔内部的腐蚀产物浓度随蚀孔体积及极化电位增加而降低,孔内点蚀电流密度及蚀孔开放程度均随极化电位的升高而增大,基于扩散控制理论计算得到的孔内腐蚀产物浓度理论值显著高于ICP-OES实测值,高极化电位下304不锈钢上生成的蚀孔具有更大的孔内点蚀电流密度及更低的孔内腐蚀产物浓度,说明在阳极极化下,304不锈钢上生成的三维稳态蚀孔的生长速度并不完全受控于腐蚀产物的扩散过程,受电化学活化控制的程度更大。

关键词(KeyWords)： 不锈钢;点蚀;蚀孔生长速度;腐蚀产物浓度

Abstract:

Keywords:

基金项目(Foundation): 河北省自然科学青年基金(E2019409052);; 河北省高等学校科学技术研究青年基金(QN2019104);; 廊坊市科技支撑计划项目(2020011030)

作者(Author): 田文明,田文庆,李忠磊,康会峰,程法嵩,李艳霞

DOI: 10.13289/j.issn.1009-6264.2021-0139

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