Hot corrosion behaviour of a cobalt-base super-alloy K40S with and without NiCrAlYSi coating |
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| Authors: | K Zhang MM Liu SL Liu C Sun FH Wang |
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| Affiliation: | aChemistry and Life College, Shenyang Normal University, 253 Huanghe Street, Shenyang 110034, PR China;bState Key Lab for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, PR China |
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| Abstract: | A NiCrAlYSi coating was deposited by arc ion plating on a cobalt-base super-alloy K40S to improve its hot corrosion resistance at 1173 K in air. The K40S suffered from accelerated corrosion and formed non-protective scale with poor adherence when its surface was beneath Na2SO4 and Na2SO4 containing 25 wt.% NaCl salt deposits. After the K40S was coated with NiCrAlYSi coating, a protective α-Al2O3 scale was formed on the coating. Although the NiCrAlYSi coating changed into NiCoCrAlYSi during corrosion processes, it still possessed good corrosion resistance. In addition, the corrosion mechanisms were discussed on a basis of basic fluxing model. |
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| Keywords: | A Cobalt A Super-alloys A Metal coatings B EPMA C Hot corrosion |
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