Inconel625与Inconel601合金耐高温氯离子腐蚀性能及机理的比较研究  

Comparative study of high temperature chloride corrosion resistance and mechanism of Inconel625 and Inconel601 alloys

作　　者：吴勇 孟施旭 孙清云 陈辉 夏思瑶 杨甫 夏春怀 杨汉哲 Wu Yong;Meng Shixu;Sun Qingyun;Chen Hui;Xia Siyao;Yang Fu;Xia Chunhuai;Yang Hanzhe(Wuhan Research Institute of Materials Protection Co.,Ltd.,CAM,Wuhan Hubei 430030,China;State Key Laboratory of Special Surface Protection Materials and Application Technology,Wuhan Hubei 430030,China)

机构地区：[1]中国机械总院集团武汉材料保护研究所有限公司,湖北武汉430030 [2]特种表面保护材料及应用技术国家重点实验室,湖北武汉430030

出　　处：《金属热处理》2023年第9期208-213,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2020YFB2010400);湖北省重点研发计划(2021BAA210);国家自然科学基金面上项目(52175182);湖北省自然科学基金(2022CFB936)。

摘　　要：利用SEM、EDS以及XRD等分析手段研究了Inconel625和Inconel601合金的耐高温氯离子腐蚀性能以及腐蚀机理,对比分析了两种合金在1100℃高温氯离子腐蚀条件下的腐蚀动力学曲线、腐蚀产物以及腐蚀层的表面、截面形貌。结果表明,Inconel625和Inconel601合金都表现为前期腐蚀迅速后期平缓,Inconel625合金的耐高温氯离子腐蚀性能优于Inconel601合金。Inconel625合金在腐蚀过程中生成了含有复杂氧化物的氧化膜,Inconel601合金主要的腐蚀产物有Cr_(2)O_(3)、AlFeO_(3)以及Al_(18)Cr_(5)相,Inconel625合金主要的腐蚀产物有Al_(2)O_(3)、Fe_(2)O_(3)、Cr_(5)O_(12)以及NiCrO_(4)相。Inconel625合金由于Nb元素的钉扎作用以及尖晶石结构的NiCrO_(4)的生成,增大了氧化膜的附着力,使其耐蚀性优于Inconel601合金。High temperature chloride ion corrosion resistance and corrosion mechanism of Inconel625 and Inconel601 alloys were studied by means of SEM,EDS and XRD.The corrosion kinetics curves,corrosion products and surface and cross section morphology of the corrosion layer of the two alloys were compared and analyzed under the condition of chloride ion corrosion at 1100 ℃.The results show that both Inconel625 and Inconel601 alloys exhibit rapid corrosion in the early stage and gentle corrosion in the later stage.The high temperature chloride corrosion resistance of the Inconel625 alloy is better than that of the Inconel601 alloy.In the corrosion process of the Inconel625 alloy,an oxide film containing complex oxides is formed.The main corrosion products of the Inconel601 alloy are Cr_2O_3,AlFeO_(3) and Al_(18)Cr_(5) phases,while the main corrosion products of the Inconel625 alloy are Al_2O_3,Fe_2O_3,Cr_5O_(12) and NiCrO_(4) phases.The Inconel625 alloy has better corrosion resistance than the Inconel601 due to the pinning effect of Nb element and the formation of NiCrO_(4) with spinel structure,which increases the adhesion of oxide film.

关 键 词：INCONEL625合金 高温 氯离子 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]