余翠兰,张钰柱,宋斌杰

• 1:重庆移通学院智能工程学院
• 2:北京ABB电力系统有限公司

摘要(Abstract)：

为了研究2507双相不锈钢在海水脱硫环境中的耐腐蚀性能，利用开路电位、电化学阻抗谱、动电位极化法、恒电位极化法、Mott-Schottky曲线和扫描电镜等研究了2507双相不锈钢在海水脱硫环境中的腐蚀行为。结果表明：2507双相不锈钢在海水脱硫环境中的腐蚀形式为点蚀。随着NaHSO_3浓度的增大，2507双相不锈钢的开路电位、自腐蚀电位E_(corr)和点蚀击穿电位E_b负移，钝化膜电阻R_(ct)减小，腐蚀电流密度I_(corr)增大，耐腐蚀性能下降。HSO~-_3与Cl~-的竞争吸附对点蚀具有协同促进作用，HSO~-_3参与钝化膜的钝化过程并形成金属硫酸盐，钝化膜点缺陷密度增大，载流子密度增大，导电性提高，钝化膜屏蔽作用下降。

关键词(KeyWords)： 2507双相不锈钢;海水脱硫;点蚀;钝化膜;耐腐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 重庆市教委科学技术研究项目(KJQN202002402)

作者(Author): 余翠兰,张钰柱,宋斌杰

DOI: 10.13289/j.issn.1009-6264.2022-0334

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