WC-Co系サーメット溶射材の溶射圧力および皮膜成分による腐食疲労強度の向上(<特集>腐食防食)

概要

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The authors previously reported that the corrosion fatigue strength of thermally sprayed coatings was enhanced by changing the powder composition. This effect was recognized at low stress area near endurance limit on S-N curve but not the high stress amplitude level. This study focused on the spraying pressure as well as the powder composition. The mechanical, corrosion, and corrosion fatigue fracture properties were investigated for three thermal spray materials fabricated by a spray gun with variable pressure. The corrosion fatigue strength of a specimen coated by WC/NiCrMo-A was the highest in the three type of coated specimen. It is thought that the mechanochemical response was controlled by a combination of: (1) The residual compressive stress generated by high spraying pressure for decreasing the effective stress, and (2) Enhanced corrosion resistance resulting from easy passivation of the coating components and the densification of the coating without any penetration of the solution into the base metal/coating-interface.
社団法人日本材料学会の論文
2006-11-15