Mechanical and corrosion resistant properties of martensitic stainless steel plasma nitrocarburized with rare earths addition

• Published in: Journal of rare earths Vol. 30; no. 8; pp. 826 - 830
• Main Author: 刘瑞良 乔英杰 闫牧夫 傅宇东
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2012
• Subjects: 17-4PH; Carbonitriding; corrosion; Corrosion resistance; Ethanol; Ethyl alcohol; Hardness; Martensitic stainless steels; mechanical property; microstructure; plasma nitrocarburizing; Precipitation; Rare earth metals; rare earths (RE); 机械; 离子氮碳共渗; 稀土; 耐腐蚀性能; 腐蚀电流密度; 表面硬度; 马氏体不锈钢; corrosion; rare earths (RE); mechanical property; microstructure; plasma nitrocarburizing
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(12)60138-0

In order to improve surface hardness and corrosion resistant property of 17-4PH martensitic stainless steel, the steel was plasma nitrocarburized at 560 ℃ for 2-4 h in a gas mixture of nitrogen, hydrogenand ethanol with rare earths （RE） addition. The experimental results showed that the modified layer was characterized by a compound layer containing two distinct zones （i.e. out ~dark zone＇ and inner ＇white zone＇）. The inner ＇white zone＇ was almost a precipitation free zone and had high hardness as well as good corrosion resistance. An- odic polarization test results showed that the specimens plasma nitrocarburized with RE addition had good corrosion resistance resulted mainly from their higher corrosion potentials, lower corrosion current densities and larger passive regions as compared with those of the un- treated one.