Wear resistance and hot corrosion behaviour of|
laser cladding Co-based alloy
laser cladding Co-based alloy
(1. School of Materials Science and Engineering,
Shenyang Polytechnic University, Shenyang 110023, P.R.China；
2. State Key Laboratory for Corrosion and Protection of Metals,
Chinese Academy of Science, Shenyang 110016, P.R.China；
3. Department of Manufacturing Engineering,
Hong Kong Polytechnic University, Hong Kong, P.R.China)
Shenyang Polytechnic University, Shenyang 110023, P.R.China；
2. State Key Laboratory for Corrosion and Protection of Metals,
Chinese Academy of Science, Shenyang 110016, P.R.China；
3. Department of Manufacturing Engineering,
Hong Kong Polytechnic University, Hong Kong, P.R.China)
Abstract: 2Cr13 stainless steel was surface cladded with Co-based alloy using a high power carbon dioxide laser. The microstructure, wear resistance and corrosion properties of the clad layer were investigated. It is found that the high temperature corrosion behavior and wearing resistant property of the clad layer are 3 and 2.5 times higher than those of the parent metal. Under the high temperature molten lead sulphate salt corrosion condition, the clad layer fails by spalling which is caused by intergrannular corrosion within the clad layer. The fine dendritic structure and the oxide help to retard the penetration of the sulphur ion that induces the intergrannular corrosion.
Key words: laser cladding； Co-based alloy； wear resistance； hot corrosion