煤灰中碱金属硫酸盐和氯盐含量对HR3C和渗铝HR3C不锈钢腐蚀行为的影响  

Influence of Alkali Metal Sulfate-and Chloride-salts Content in Artificial Coal Ash on Corrosion Behavior of HR3C Steels With and Without Aluminizing

作　　者：喻政 陈明辉[1] 王金龙[1] 杨莎莎 王福会[1] YU Zheng;CHEN Minghui;WANG Jinlong;YANG Shasha;WANG Fuhui(Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学沈阳材料科学国家研究中心联合研究分部,沈阳110819

出　　处：《中国腐蚀与防护学报》2024年第6期1389-1398,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：教育部中央高校基本科研业务费项目(N2302018);宁波余姚市科技创新项目(2023J03010010)。

摘　　要：研究了700℃时煤灰中的碱金属硫酸盐(Na_(2)SO_(4)+K_(2)SO_(4))和氯盐(KCl)含量对HR3C和渗铝HR3C腐蚀的影响。合金的腐蚀形式为氧化+内硫化/氧化。当不存在氯盐时,合金的腐蚀深度随着Na_(2)SO_(4)+K_(2)SO_(4)的质量分数呈线性增加。渗铝的HR3C合金仅发生了轻微的氧化。保持碱金属的含量不变,增加KCl的含量至0.5%、1%、2%(质量分数)时,HR3C的腐蚀程度呈跳跃式的加剧,渗铝样品依然保持着良好的腐蚀抗性。The corrosion behavior of HR3C steels with and without aluminizing beneath simulated coal ash deposits with varying content of alkali metal sulfate(Na_(2)SO_(4)+K_(2)SO_(4))and chloride(KCl)salts was comparatively studied in a gas mixture of SO_(2),O_(2),H_(2)O and CO_(2) at 700℃.The corrosion form of steels is oxidation with internal-sulfidation and-oxidation.When there is no chloride salt in the ash deposits,the corrosion depth of the alloy increases linearly with the mass fraction of Na_(2)SO_(4)+K_(2)SO_(4).However,the aluminized HR3C steel only underwent slight oxidation.When the content of alkali salts remains unchanged,while the content of KCl increases successively to 0.5%,1%and 2%(mass fraction),the corrosion degree of HR3C is intensified in a jumping manner,but the aluminized ones still maintain good corrosion resistance.

关 键 词：不锈钢 热腐蚀 煤灰腐蚀 烟气腐蚀 渗铝涂层 

分 类 号：TG172[金属学及工艺—金属表面处理]