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首页> 外文学位 >STRESS CORROSION CRACKING AND PITTING OF SENSITIZED TYPE 304 STAINLESS STEEL IN CHLORIDE SOLUTIONS CONTAINING SULFUR SPECIES AT TEMPERATURES FROM 50 TO 200 DEGREES C.
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STRESS CORROSION CRACKING AND PITTING OF SENSITIZED TYPE 304 STAINLESS STEEL IN CHLORIDE SOLUTIONS CONTAINING SULFUR SPECIES AT TEMPERATURES FROM 50 TO 200 DEGREES C.

机译：含硫物种的氯化物溶液中温度从50到200摄氏度时，敏化304不锈钢的应力腐蚀开裂和点蚀。

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摘要

Stress corrosion cracking of sensitized type 304 stainless steel has been studied in pure water, chloride solutions with and without sulfur species at temperatures from 50 to 200(DEGREES)C using the slow strain rate technique. Pitting corrosion was also studied in the same environment using the potentiostatic method. The stress corrosion cracking tendency shows a special temperature dependency in the presence of sulfur species in air saturated chloride solutions. At temperature below 100(DEGREES)C, the presence of sulfide and thiosulfate ions promotes stress corrosion cracking. At 150(DEGREES)C, sulfide ions inhibit stress corrosion cracking while thiosulfate ions promote it. At 200(DEGREES)C, both anions inhibit stress corrosion cracking. However, stress corrosion cracking does not occur in the sulfide solution in the absence of chloride ions. Even when sulfide and chloride ions are present in the solution simultaneously, the decrease of dissolved oxygen content significantly decreases the susceptibility to SCC. Pitting corrosion shows the same temperature dependency in the temperature range from 50 to 200(DEGREES)C in the solutions containing sulfur species. Sulfide ions form either a protective or non-protective iron-sulfide film, depending on the temperature. At temperatures below 100(DEGREES)C, sulfide ions form a non-protective iron sulfide film and promote SCC and pitting. At temperatures above 150(DEGREES)C, however, they form a protective iron sulfide film and inhibit SCC and pitting. Thiosulfate ions are adsorbed and promote SCC and pitting by activating anodic dissolution and by impeding repassivation.
机译：使用慢应变速率技术，在温度为50至200（DEGREES）C的纯水，氯化物溶液中，无论有无硫，都研究了敏化304不锈钢的应力腐蚀开裂。还使用恒电位法在相同环境中研究了点蚀。在空气饱和氯化物溶液中存在硫物质时，应力腐蚀开裂趋势显示出特殊的温度依赖性。在低于100℃的温度下，硫化物和硫代硫酸根离子的存在会促进应力腐蚀开裂。在150°C时，硫化物离子会抑制应力腐蚀开裂，而硫代硫酸盐离子会促进应力开裂。在200°C下，两种阴离子均抑制应力腐蚀开裂。但是，在不存在氯离子的情况下，硫化物溶液中不会发生应力腐蚀裂纹。即使溶液中同时存在硫化物和氯离子，溶解氧含量的降低也会显着降低对SCC的敏感性。在含硫物质的溶液中，点蚀在50至200（DEGREES）C的温度范围内显示出相同的温度依赖性。取决于温度，硫化物离子会形成保护性或非保护性的硫化铁膜。在低于100°C的温度下，硫化物离子会形成非保护性硫化铁膜并促进SCC和点蚀。然而，在高于150℃的温度下，它们会形成保护性的硫化铁膜并抑制SCC和点蚀。硫代硫酸盐离子通过活化阳极溶解和阻止再钝化而被吸附并促进SCC和点蚀。

著录项

  • 作者

    LEE, JONG-KWON.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 261 p.
  • 总页数 261
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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