This special coating with the ball - disc machine on the friction and wear tester. Using the scanning electron microscope (SEM), X-ray analyzer to analyze the surface composition and surface observation. HV hardness was determined to be 1,118 at room temperature, and hard chrome 900 HVAC. Hardness HV of the deposition of Ni-Co-Fe coating did not change until the temperature reaches 300C, where it went to 1552; 400C, 1422; 500C, 1300; 600C, it is 1190 and 700C, it is 1,040 .
The wear rate of the nickel-iron-cobalt coatings 110.56 10-17 [m.sup.3 / nautical miles (: V = lumen / S, P = 600 N, T = 30 minutes). Wear-resistant hard chrome was 241.11 10-17 [m.sup.3] / NM: [2,3].
Other cobalt-based coating test and found that the coatings as well as adhere to the carbon and mild steel substrate, however, apparent cracks in the coating, the 500C temperature and higher. Cobalt-tungsten coating in the 600C and peel than hexavalent chromium plating coating soft. Therefore, these will not be considered as alternative to hexavalent chromium plating. Tungsten alloy plating coating performance impact is not ideal on behalf of the chrome plating.
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