Effect of yttrium nitrate on properties of Co-W-P alloy coatings electrodeposited on brass matrix
Yttrium nitrate was added to the plating solution as an additive,and the effect of the addition amount of yttrium nitrate on the appearance,microstructure,hardness,wear resistance and scratch resistance of the Co-W-P alloy coatings electrodeposited on brass matrix was studied.The results show that changing the addition amount of yttrium nitrate has no obvious effect on the appearance,covering ability,position of diffraction peak and preferred orientation of Co-W-P alloy coatings,but adding appropriate amount of yttrium nitrate can reduce the number of holes in Co-W-P alloy coating,improve the surface compactness gradually,increase the hardness and improve the wear resistance and scratch resistance obviously.The Co-W-P alloy coating electrodeposited with yttrium nitrate 3 g/L has flat and dense surface,showing a preferred orientation of(200)crystal plane.The hardness reaches 536.8 HV,the wear amount is only 4.6 mg/cm2 and the surface wear degree is light,showing good wear resistance and scratch resistance.
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