3544 Corrosion Fatigue of Hastelloy Sprayed Coating under Pulsating Tensile Stress
Details
WC sprayed coatings are often occurred the corrosion fatigue fracture under the aqueous solution, because corrosion pits generate at the interface between the coating and the substrate. 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.
