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Surface white spot and pitting corrosion of 316 L stainless steel
Anti-Corrosion Methods and Materials ( IF 1.2 ) Pub Date : 2020-12-23 , DOI: 10.1108/acmm-10-2020-2383
Guanghui Yi , Dajiang Zheng , Guang-Ling Song

Purpose

The purpose of this paper is to address the concern of some stainless steel users. To understand the effect of surface white spots on corrosion performance of stainless steel.

Design/methodology/approach

White spots appeared on some component surfaces made of 316 L stainless steel in some industrial applications. To address the concern about the pitting performance in the spot areas, the pitting corrosion potential and corrosion resistance were measured in the spot and non-spot areas by means of potentiodynamic polarization and electrochemical impedance spectroscopy and the two different surface characteristics were analytically compared by using optical microscopy, laser confocal microscopy, scanning electron microscopy, x-ray diffraction, energy dispersive spectroscopy and auger energy spectroscopy. The results indicated that the pitting performance of the 316 L stainless steel was not negatively influenced by the spots and the white spots simply resulted from the slightly different surface morphology in the spot areas.

Findings

The white spots are actually the slightly rougher surface areas with some carbon-containing species. They do not reduce the pitting resistance. Interestingly, the white spot areas even have slightly improved general corrosion resistance.

Research limitations/implications

Not all surface contamination or roughening can adversely affect the corrosion resistance of stainless steel.

Practical implications

Stainless steel components with such surface white spots are still qualified products in terms of corrosion performance.

Originality/value

The surface spot of stainless steel was systematically investigated for the first time for its effect on corrosion resistance and the conclusion was new to the common knowledge.



中文翻译:

316 L不锈钢的表面白斑和点蚀

目的

本文的目的是解决一些不锈钢用户的关注。了解表面白斑对不锈钢腐蚀性能的影响。

设计/方法/方法

在某些工业应用中,某些由316 L不锈钢制成的组件表面上会出现白点。为了解决对点区域的点蚀性能的担忧,通过电势极化和电化学阻抗谱法测量了点区域和非点区域的点蚀电位和耐蚀性,并通过分析比较了两种不同的表面特性。光学显微镜,激光共聚焦显微镜,扫描电子显微镜,x射线衍射,能量色散光谱和螺旋钻能量光谱。结果表明,316 L不锈钢的点蚀性能不受斑点的负面影响,白色斑点仅是由斑点区域中表面形态略有不同引起的。

发现

白色斑点实际上是带有一些含碳物质的较粗糙的表面积。它们不会降低耐点蚀性。有趣的是,白斑区域甚至具有略微改善的总体耐腐蚀性。

研究局限/意义

并非所有的表面污染或粗糙都会对不锈钢的耐腐蚀性产生不利影响。

实际影响

就腐蚀性能而言,具有此类表面白点的不锈钢组件仍是合格产品。

创意/价值

首次系统地研究了不锈钢表面斑点对耐蚀性的影响,该结论对常识而言是新的。

更新日期:2021-02-17
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