典型因素对不锈钢钝化稳定性影响的初步研究-材料工程专业论文.docxVIP

results found that polarization resistance of 2507 duplex stainless steel in alkaline solution increased greatly in a short time and tend to be stable with the extending of the immersion time, the polarization resistance of pH9.5 nearly an order of magnitude high than the other two solutions. The results show that the stability of the passive film formed on stainless steel increased with the decreasing of pH . The influence of alloying elements on the stability of passive film was investigated by electrochemical noise and other techniques. The addition of Al and Ce element made the SSET have a fine grain structure and a well mechanical properties to meet the requirements for the expandable tubulars material. The existence of aluminum influenced the distribution of chromium oxides causing the existence of Cr deplete area of passive, pits nucleated and propagated in these positions and developed into stable pitting. Key words : stainless steel ;passive film ; pH ; chloride ions; alloying elements 目录 HYPERLINK \l _bookmark0 第一章 绪论1 HYPERLINK \l _bookmark1 1.1 引言1 HYPERLINK \l _bookmark2 1.2 合金元素对钝化膜稳定性的影响1 HYPERLINK \l _bookmark3 Cr 元素 1 HYPERLINK \l _bookmark4 Ni 元素 2 HYPERLINK \l _bookmark5 Mn 元素 2 HYPERLINK \l _bookmark6 Mo 元素 2 HYPERLINK \l _bookmark7 W 元素 3 HYPERLINK \l _bookmark8 N 元素 3 HYPERLINK \l _bookmark9 1.3 环境因素对钝化膜稳定性的影响3 HYPERLINK \l _bookmark10 1.3.1 氯离子3 HYPERLINK \l _bookmark11 氯离子点蚀破坏机理3 HYPERLINK \l _bookmark12 1.3.2 硫化氢5 HYPERLINK \l _bookmark13 概述5 HYPERLINK \l _bookmark14 硫化氢腐蚀5 HYPERLINK \l _bookmark15 影响硫化氢腐蚀的因素6 HYPERLINK \l _bookmark16 含硫环境中金属腐蚀的研究现状7 HYPERLINK \l _bookmark17 1.3.3 pH 7 HYPERLINK \l _bookmark18 1.3.4 温度7 HYPERLINK \l _bookmark19 1.4 研究不锈钢钝化行为的电化学检测技术8 HYPERLINK \l _bookmark20 1.4.1 丝束电极技术8 HYPERLINK \l _bookmark21 1.4.2 电化学阻抗谱9 HYPERLINK \l _bookmark22 1.4.3 电化学噪声10 HYPERLINK \l _bookmark23 1.4.4 动电位极化 11 HYPERLINK \l _bookmark24 1.4.5 Mott-Schottky 分析 12 HYPERLINK \l _bookmark25 1