TiO2 APPLICATION AS BONDCOAT FOR CYLINDER BORE THERMAL SPRAY

摘要

An engine cylinder bore with a plated bondcoat and a method of coating the surface of an engine cylinder bore. This method includes electroplating a bondcoat to the surface such that a substantial entirety of its inner circumference that corresponds to a piston travel path within the cylinder bore is covered. Cleaning or related pretreatment operations to properly activate the plated surface helps to ensure a durable coupling of a subsequently-applied thermal spray coating. In one preferred form, the cylinder bore is made from an aluminum-based alloy or a magnesium-based alloy that may be roughened prior to applying the bondcoat, while the bondcoat is plated using a titanium-based material such that a relatively thin TiO₂ layer is formed on the cylinder bore. In another preferred form, the thermal spray coating is made of an iron-based material.