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

doi:10.11902/1005.4537.2024.015

中国腐蚀与防护学报

2024, Vol. 44

Issue (6): 1389-1398 CSTR: 32134.14.1005.4537.2024.015 DOI: 10.11902/1005.4537.2024.015

研究报告

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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

喻政, 陈明辉(

), 王金龙, 杨莎莎, 王福会

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

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

YU Zheng, CHEN Minghui(

), WANG Jinlong, YANG Shasha, WANG Fuhui

Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

引用本文:

喻政, 陈明辉, 王金龙, 杨莎莎, 王福会. 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[J]. 中国腐蚀与防护学报, 2024, 44(6): 1389-1398.
Zheng YU, Minghui CHEN, Jinlong WANG, Shasha YANG, Fuhui WANG. Influence of Alkali Metal Sulfate- and Chloride-salts Content in Artificial Coal Ash on Corrosion Behavior of HR3C Steels With and Without Aluminizing[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1389-1398.

全文: PDF(19034 KB) HTML

摘要:

研究了700℃时煤灰中的碱金属硫酸盐(Na₂SO₄ + K₂SO₄)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Na₂SO₄ + K₂SO₄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。

关键词 ：不锈钢, 热腐蚀, 煤灰腐蚀, 烟气腐蚀, 渗铝涂层

Abstract：

The corrosion behavior of HR3C steels with and without aluminizing beneath simulated coal ash deposits with varying content of alkali metal sulfate (Na₂SO₄ + K₂SO₄) and chloride (KCl) salts was comparatively studied in a gas mixture of SO₂,O₂, H₂O and CO₂ at 700^oC. 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 Na₂SO₄ + K₂SO₄. 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.

Key words： stainless steel hot corrosion coal ash corrosion fireside corrosion aluminide coating

收稿日期: 2024-01-11 32134.14.1005.4537.2024.015

ZTFLH:

TG172

基金资助: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)

通讯作者: 陈明辉，E-mail：mhchen@mail.neu.edu.cn，研究方向为高温涂层与防腐自润滑材料

Corresponding author: CHEN Minghui, E-mail: mhchen@mail.neu.edu.cn

作者简介: 喻政，男，1995年生，博士生

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表1 模拟煤灰成分的质量分数 (mass fraction / %)

图1 A-HR3C的表面、截面形貌和HR3C的表面形貌及对应的XRD谱

图2 HR3C和A-HR3C在不同煤灰中腐蚀1000 h后的宏观照片

图3 HR3C和A-HR3C在700℃模拟煤灰中腐蚀1000 h的质量变化曲线

图4 HR3C在700℃不同的模拟煤灰中腐蚀1000 h的XRD谱

图5 HR3C合金在1~6#煤灰中腐蚀1000 h后的表面形貌

图6 HR3C合金在1~6#煤灰中腐蚀1000 h后的截面形貌

表2 图5中各区域的元素成分分析 (atomic fraction / %)

图7 HR3C合金在1~6#煤灰中腐蚀1000 h后腐蚀区的厚度

图8 A-HR3C在700℃不同的模拟煤灰中腐蚀1000 h的XRD谱

图9 A-HR3C合金在1~6#煤灰中腐蚀1000 h后的表面形貌

图10 A-HR3C合金在1~6#煤灰中腐蚀1000 h后的截面形貌

表3 图9中各区域的元素成分分析 (atomic fraction / %)

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