摘要相不锈钢广泛应用于海洋建筑、输油输气管道、储酸设备等领域。然而在其服役的 过程中，由于服役环境中杂质离子的存在以及人为施加的阴极保护措施，导致氢等 杂质离子进入内部，加之以应力的耦合作用， 2205 双相不锈钢出现脆性开裂，招 致极其严重的生产事故。79860

本文通过测试 2205 双相不锈钢 1050℃固溶处理后在不同腐蚀介质环境下的 电化学极化曲线以及阻抗谱，SSRT 慢应变速率拉伸实验的数据，分析不同腐蚀介 质对 2205 双相不锈钢的氢脆敏感性的影响。

电化学实验结果显示，2205 双相不锈钢于 1050℃固溶处理后，在各腐蚀介质 环境下表现出的腐蚀敏感性从大到小排列为 3。5%NaCl>0。5M H2SO4>0。4M HCl。 SSRT 实验结果显示在试样进行充氢后，韧性均有所下降，其中以 3。5%NaCl 及 0。5M H2SO4 腐蚀液中材料韧性降低最为显著，而在 0。4M HCl 中则很不明显。

毕业论文关键字：2205 双相不锈钢；慢应变速率拉伸实验；电化学实验；氢脆敏感性

Abstract 2205 Duplex stainless steel (DSS) is composed of ferrite(α) and austenite(γ) phases not only have excellent mechanical properties of ferrite phase, but also have great corrosion resistance of the austenitic phase。 DSS2205 is widely used in marine constructions, acid storage containers, and oil and gas pipeline because of these great well-balanced characteristics。 However, during the service of DSS2205, since service condition contains large amounts of impurity ions, combined with artificial protection measures, such as cathodic protection, causing hydrogen ion permeate into the interior of DSS easier。 Combination of applied stress and hydrogen, 2205 duplex stainless steel appeared brittle fracture, resulting in an extremely serious production accident。

In this paper, make the sample of 2205 Duplex stainless steel after  1050℃solution

treatment in different corrosion solutions, and have them hydrogen charged and free respectively。 Then we have Electrochemical Experiments and Slow Strain Rate Tension Experiments, at last analyse the effect of different corrosion solutions impose on the hydrogen embrittlement of 2205 duplex stainless steel。

The result supposes that，after temperature 1050℃ solid treatment of   DDS2205,

the corrosion susceptibility in different media environment is 3。5%NaCl>0。5M H2SO4>0。4M HCl in sequence。 And after the sample were filled with hydrogen, their toughness decreased。 And the decrease of toughness in 3。5%NaCl is the most obvious one。

Key words: 2205 duplex stainless steel; polarization curve; AC impedance; SSRT

目录

第一章 绪论 1

1。1  双相不锈钢 1

1。1。1 概述 1

1。1。2  双相不锈钢的分类与成分 1

1。1。3  双相不锈钢的性能与应用 2

1。2  金属材料的氢脆 4

1。2。1  氢在金属中的存在形式 4

1。2。2  氢脆的产生机理 5

1。2。3  氢脆的类型和特征 5

1。2。4  氢脆的防止措施 6

1。3  研究双相不锈钢在各腐蚀介质中氢脆敏感性的目的和意义 7

1。4  本文研究的主要内容 8

第二章 实验材料及试验方法