ORDINARY TEMPERATURE ARC TYPE METAL SPRAYING METHOD USING TIN AS THERMAL SPRAYING MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide high performance by a metal spraying method of forming a corrosion prevention film or an electromagnetic shielding film where various materials can be selected as base materials, and the adhesive strength of thermal spraying metal is increased.;SOLUTION: Using an ordinary temperature arc type thermal spraying machine, compressive air is not directly applied to an arc part, but it is drawn with negative pressure to increase air pressure, thus the fine grains of tin having complicated projections with uniform shape and size are obtained. The low melting point-soft metal tin molten fine grains accelerated by low temperature ejected air and collided against a base material are effectively cooled, infiltrate into all the corners of a face having a low roughening degree, and retain bonding strength. Since the thermally sprayed surface of the tin film has a suitable roughness, the upper layer thereof is thermally sprayed with the other thermal spraying material to stack the film. Since the tin maintaining high electromagnetic wave shielding effect over a long period can be thermally sprayed on various base materials including building materials, it is thermally sprayed on building materials using a cold arc type thermal spraying machine. Using concrete incorporated with steel as a base metal, the tin can form a sprayed coating at a high sticking ratio, and, at the time when titanium is thermally sprayed on the upper layer thereof, and electric current is made to flow from an external power source device, electrolytic protection effect can be obtained.;COPYRIGHT: (C)2006,JPO&NCIPI