首页|K452合金表面CVD渗铝涂层制备温度对其750℃硫酸盐热腐蚀行为的影响

K452合金表面CVD渗铝涂层制备温度对其750℃硫酸盐热腐蚀行为的影响

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采用化学气相沉积(CVD)技术在K452合金表面沉积渗铝涂层,沉积温度分别为850、950和1050℃.研究了沉积温度对CVD渗铝涂层在750℃空气中表面沉积Na2SO4及Na2SO4+NaCl环境下热腐蚀行为的影响.采用扫描电子显微镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)对腐蚀前和后的试样进行截面形貌观察和物相结构分析.结果表明,在750℃下表面沉积Na2SO4及Na2SO4+NaCl热腐蚀50h后,3种涂层试样均表现出了较K452合金更好的抗热腐蚀性能,且涂层的抗热腐蚀性能随着涂层沉积温度的增加而增强.
Effect of Coating Process Temperatures on Hot Corrosion Be-havior Induced by Deposit of Sulfates Salts in Air at 750℃ for CVD Aluminized Coatings on K452 Superalloy
Aluminized coatings were deposited on K452 superalloy by chemical vapor deposition(CVD)technique at the temperatures 850,950 and 1050℃,respectively.The effect of deposition temper-ature on the corrosion behavior of K452 alloys without and with CVD aluminized coatings was compara-tively investigated beneath deposits of Na2SO4 and Na2SO4+NaCl(3±0.2 mg/cm2),respectively in air at 750℃.Then their cross-sectional morphologies and phase structures were characterized by SEM/EDS and XRD.The results showed that all the aluminized coatings exhibited better corrosion resistance to the deposits of Na2SO4 and Na2SO4+NaCl as compared to the bare K452 alloy after 50 h of corrosion.Notably,the corrosion resistance of the coatings was increased with the increase in deposition temperatures.

CVD aluminized coatingsdeposition temperatureNa2SO4-induced corrosionNa2SO4+NaCl-induced corrosion

徐佳新、耿树江、王金龙、王福会、孙清云、吴勇、夏思瑶

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东北大学 沈阳材料科学国家研究中心东北大学联合研究分部 沈阳 110819

中国机械总院集团武汉材料保护研究所有限公司 武汉 430030

CVD渗铝涂层 沉积温度 Na2SO4腐蚀 Na2SO4+NaCl腐蚀

国家重点研发计划湖北省重点研发计划

2020YFB20104002021BAA210

2024

中国腐蚀与防护学报
中国腐蚀与防护学会 中国科学院金属研究所

中国腐蚀与防护学报

CSTPCD北大核心
影响因子:0.819
ISSN:1005-4537
年,卷(期):2024.44(3)