The optimal catalytic activity of the electrodeposited Ni-P coating with the control of the process parameters was performed in this study by using Taguchi’s method. The controlled process parameters included current density, duty cycle and the concentration of the phosphorous acid in the electrolyte. The correlation among the controlled parameters and the resulted hydrogen evolution reaction (HER) activity was discussed with emphasis on the influence of the P content, internal stress, roughness and grain size of the coating. The optimal HER property was obtained for the electrodeposition of Ni-P coating with a phosphorous acid concentration of 5g/l, current density of 16A/dm2 and duty cycle of 100 %. The resulted Ni-P coating with a better HER property was the one with P content 3at%, an internal stress higher than 10MPa, grain size 10~15nm and surface roughness higher than 100nm. In addition, the cracking of the coating due to high internal stress favored the raise of the HER activity.
Taguchi’s method, electrodeposited Ni-P coating, hydrogen evolution rate, phosphorous acid
The partial financial support from National Science Council, Taiwan under Grant Nos. NSC 99-2221-E-212-003 and 98-2221-E- 027 -083 -MY3 are acknowledged. The Taguchi Method guided by Prof. F. J. Yu, Industrial Engineering & Technology Management, Da-Yeh University, is gratefully acknowledged.
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