Hot corrosion behaviors of 921A alloy and HVAF-sprayed Fe-based amorphous coating covered with KCl-ZnCl_(2) salts  

作　　者：Hai-liang Zhang Ling-xu Yang Qian Wang Jiang-tao Wu Suo-de Zhang Chao-liu Zeng 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,Liaoning,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,Guangdong,China [4]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2023年第8期1537-1549,共13页

基　　金：supported by GuangDong Basic and Applied Basic Research Foundation(No.2020A1515110128).

摘　　要：Hot corrosion behaviors of the 921A alloy and Fe-based amorphous coating induced by KCl-10% ZnCl_(2) and KCl-55% ZnCl_(2) salts at 450℃ in air for 40 h were investigated.Results show that the 921A alloy suffers more serious corrosion damage than the coating and KCl-55% ZnCl_(2) salts are more corrosive than KCl-10% ZnCl_(2) salts.In the two salts,an Fe_(2)O_(3) layer is formed on the 921A alloy surface,while an outer Fe-rich oxide layer and an inner Cr-rich oxide layer are formed on the surface of the coating.Moreover,a certain amount of metal chloride can be found at the oxide/alloy(coating)interface,which can be explained by "active oxidation".However,the corrosion resistance of the Fe-based amorphous coating did not achieve the desired results,probably because the intersplats in the coating serve as corrosion diffusing channels,which facilitate the corrosion damage rate.Nevertheless,the coating is still in amorphous state after hot corrosion exposure.

关 键 词：Hot corrosion Chloride deposit 921A alloy Fe-based amorphous coating Waste-to-energy plant 

分 类 号：TG174[金属学及工艺—金属表面处理]