Following methods are in use for plating wear resistance testing.

(1) Falling-sand abrasion resistance test

As shown in [Fig.1], this is a plating wear resistance testing method using a device to let abrasives fall onto plated surfaces from regulated heights.

● Abrasive Artificial abrasive Silicon carbide abrasive C#80 as defined in JIS R6111 is used. Sufficiently pre-dried at 110℃ and kept in a desiccator. ●Falling The falling abrasive amount is to be 320±10g/min. ●Testing completion point When the base material is exposed. ●Determination based on mass variation Obtained by the following formula. WR=T/（w1-w2） 　　WR：Wear resistance （S/mg） 　　w1：Mass of test specimen prior to testing （mg） 　　w2：Mass of test specimen after testing （mg） 　　T：Testing time （S）

(2) Spray wear test

This is a plating wear resistance test method using abrasives sprayed onto the test specimen by compressed air.

●Abrasive Artificial abrasive Silicon carbide abrasive C#100 as defined in JIS R6111 is used. Sufficiently pre-dried at 110℃ and kept in a desiccator. ●Falling amount The falling J abrasive amount is to be 23±1g/min. ●Determination method 1.A method where exposure of the base material to be the end of testing. 2.A method to determine by measuring wear depth of the specimen surface. For the method 2. above, the max value of the wear depth after a certain amount of time of spray is measured with a surface roughness meter or a split beam microscope, and calculated with a formula below. WR=T/t 　　WR：Wear resistance （S/μm） 　　T：Testing time （S） 　　t：Max. wear depth （μm）