Zn-Fe and Y-modified Zn-Fe coatings on 42CrMo steel via pack cementation  

作　　者：Li Liu Si-Rong Yu Wen-An Cao 

机构地区：[1]School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao,266580,China

出　　处：《Rare Metals》2021年第8期2266-2274,共9页稀有金属（英文版）

基　　金：financially supported by the Natural Science Foundation of Shandong Province of China(No.ZR2017LEM004);the Open Fund of Key Laboratory of Oil&Gas Equipment,Ministry of Education(Southwest Petroleum University)(No.OGE201702-07);the Fundamental Research Funds for the Central Universities(Nos.16CX06020A and 18CX02091A)。

摘　　要：Zn-Fe and Y-modified Zn-Fe coatings were prepared on 42 CrMo steel through pack cementation processes at 370,390 and 410℃ for 4 h.Y modification was achieved through the co-deposition of Zn and Y_(2)O_(3).The effects of Y modification on microstructure,formation and corrosion behavior of the Zn-Fe coating were investigated.The coating thickness increased with an increase in temperature.The Y-modified Zn-Fe coating was thicker than the plain Zn-Fe coating.Both the Zn-Fe coating and Y-modified Zn-Fe coating showed single-layered structures,but the overall microstructure was improved by Y modification.The activation energies for Zn-Fe coating and Y-modified Zn-Fe coating were 113.15 and80.65 kJ·mol^(-1),respectively.The Zn-Fe coating consisted of FeZn_(13) and Fe11Zn40 phases.The effects of Y modification on the corrosion behavior of the Zn-Fe coating were evaluated through an immersion test and polarization measurements.The results showed that the corrosion resistance was improved by Y modification.

关 键 词：Pack cementation COATING MODIFICATION Activation energy CORROSION 

分 类 号：TG174.4[金属学及工艺—金属表面处理]