RUST PREVENTING METHOD OF ALUMINUM DIE CAST ALLOY FOR OUTBOARD MOTOR AND MACHINE BODY OF ALUMINUM DIE CAST ALLOY MADE OUTBOARD MOTOR APPLIED WITH RUST PREVENTING TREATMENT

摘要

PROBLEM TO BE SOLVED: To give excellent rust preventing property to a machine body of an outboard motor by anodically oxidizing the surface of the outboard motor machine body made of a die cast of the aluminum alloy containing copper, sealing treating with a potassium permanganate aq. solution and further coating the surface. ;SOLUTION: The anodically oxidized film b-1 is formed on the surface by degreasing and cleaning the surface of the outboard motor machine body a-1 made of the die cast composed of the aluminum alloy JIS ADC 10 or ADC 12 containing copper and anodically oxidizing in a sulfuric acid electrolyte bath. Successively the void of the anodically oxidized film is sealed by treating the surface of the anodically oxidized film b-1 with the potassium permanganate aq. solution. Next, A primer c-1 consisting essentially of a non-chromium type urethane modified epoxy ether resin is applied on the surface and further a top coating material d-1 and a clear coating material e-1 are applied thereon. The machine body surface of the outboard motor is treated for rust prevention at a low cost.;COPYRIGHT: (C)1998,JPO