Abstract
In order to clarify the influence of plasma-sprayed coating on the corrosion fatigue strength of 13Cr stainless steel, WC-Co, ZrO2, Cr3C2 and Co-Cr-Ni-W were plasma-sprayed on round bar fatigue test specimens of 13Cr stainless steel. The surface, the cross section of these coatings and the interface between these coatings and base metal were examined by SEM and optical microscope. Rotating corrosion fatigue tests of these coated specimens were conducted in 3% NaCl aqueous solution at a testing speed of 3600rpm.The WC-Co and ZrO2 coatings with low porosity improved corrosion fatigue strength at 107 cycles by about 70 percent. It might be concluded that the effective coating to improve corrosion fatigue strength should be of very low porosity and firmly adhesive to the base metal.On the other hand, no improvement of corrosion fatigue strength was observed by the Cr3C2 and Co-Cr-Ni-W coatings with relatively high porosity. In these specimens, corrosion fatigue cracks initiated from corrosion pits at the surface of the base metal and propagated predominantly through the intergranular path.
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