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电化学(中英文) ›› 2020, Vol. 26 ›› Issue (6): 808-814.  doi: 10.13208/j.electrochem.190418

• 研究论文 • 上一篇    下一篇

钝化与过钝化状态下304不锈钢的点蚀行为研究

沈茎1, 王子明1, 郑大江1, 宋光铃1,2,3,*()   

  1. 1. 厦门大学材料学院,海洋材料腐蚀与防护中心,福建 厦门361005
    2. 厦门大学固体表面物理化学国家重点实验室,福建 厦门361005
  • 收稿日期:2019-04-18 修回日期:2019-06-10 出版日期:2020-12-28 发布日期:2020-12-28
  • 通讯作者: 宋光铃 E-mail:guangling.song@hotmail.com
  • 基金资助:
    国家自然科学基金项目资助No(51671163);国家自然科学基金项目资助No(51731008)

Pitting Behaviors of Passivated and Trans-Passivated 304 Stainless Steel

SHEN Jing1, WANG Zi-ming1, ZHENG Da-jiang1, SONG Guang-ling1,2,3,*()   

  1. 1. Center for Marine Materials Corrosion and Protection, College of Materials, Xiamen University, Xiamen 361005, Fujian, China
    2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2019-04-18 Revised:2019-06-10 Published:2020-12-28 Online:2020-12-28
  • Contact: SONG Guang-ling E-mail:guangling.song@hotmail.com

摘要:

为了进一步了解不锈钢钝化膜与过钝化膜的性质,本文对比研究了在不同电位下极化处理后304不锈钢样品的点蚀及表面膜性质,发现空白对照组样品的点蚀电位和1.1 V过钝化处理后样品的点蚀电位相近,而0.5 V钝化处理后样品的点蚀电位较高. 扫描Kelvin探针(SKP)实验结果也验证了这一现象. 扫描电子显微镜(SEM)结果显示,空白对照组样品表面只呈现一般样品抛光后形貌;0.5 V钝化处理后的样品表面被颗粒状钝化膜所覆盖,该膜层决定了样品具有较好的耐蚀性;而1.1 V过钝化处理后的样品表面出现裂缝,导致不锈钢基体继续发生严重的局部腐蚀,可能成为过钝化膜保护性变差的主要原因.

关键词: 钝化, 过钝化, 点蚀, 不锈钢

Abstract:

In order to further understand the passivation and trans-passivation behaviors of 304 stainless steels, the samples were pretreated under different polarization potentials and their corrosion behaviors were investigated. It was found that the pitting potential of the untreated sample was the same as that of the sample treated with 1.1 V trans-passivation potential, while the pitting potential of the sample treated with 0.5 V passivation treatment was the highest. This observation was further verified by the SKP results. According to SEM observations, the surface of the untreated sample preserved a polishing morphology, while the surface of the 0.5 V passivation treated sample was covered by a passivation film decorated with small corrosion particles, performing good corrosion resistance. However, cracks appeared on the surface of the 1.1 V trans-passivation treated sample, leading to severe localized corrosion of the matrix and resulting in the deterioration of the trans-passivation film.

Key words: passivation, trans-passivation, pitting, stainless steel

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