Studies on Ni-Mo-P Coatings by Electroless Deposition

Chou, Yu Hsien; Bai, Ching Yuan; Ger, Ming-Der; Lee, Shuo Jen; Lee, Chi Yuan; Chao, Chu Lung

doi:10.4028/0-87849-458-8.333

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“…In earlier studies, it is concluded that this change in structure causes an increase in hardness and wear resistance because of the formation of grains and hard precipitations (Ref [13][14][15]. Adding refractory metal molybdenum in the Ni-P coatings improved functional properties like thermal stability and preventing crystallization of amorphous structure by increasing crystallization transformation temperature (Ref [16][17][18][19][20]. Very limited investigation has been carried out on the effect of adding molybdenum (Mo) on the Ni-B coatings.…”

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confidence: 98%

Effect of Annealing Temperature on the Corrosion Resistance of Electroless Ni-B-Mo Coatings

Serin

Gökşenli

Yüksel

et al. 2015

J. of Materi Eng and Perform

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The Ni-B-Mo coating on steel by electroless plating and the evaluation of the morphology and corrosion performance after applying heat treatments at different temperatures for 1 h were investigated in this study. The 25-lm-thick coating was uniform and adhesion between the substrate and the coating was good. The coating consisted of an amorphous-like structure in their as-plated condition, and after annealing at 400°C for 1 h, crystallized nickel, nickel borides, and molybdenum carbide were formed. Immersion tests in 10% HCl solution and potentiodynamic polarization measurements in 3.5% NaCl aqueous solution were applied to investigate corrosion resistance. The corrosion performance of heat-treated coatings was compared with steel and the as-plated coating. By increasing the annealing temperature, corrosion potential shifted toward a noble direction, corrosion current density decreased and the weight loss of specimens decreased, demonstrating an increase in corrosion resistance. Best corrosion performance was achieved by the coating heat treated at 550°C .

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