Method for preparing nickel content gradually varying zinc-nickel alloy plating on surfaces of steel and iron parts through pulse plating
A zinc-nickel alloy and pulse electroplating technology, which is applied in the field of surface treatment of steel parts and metal materials, can solve the problems of insufficient bonding force and corrosion resistance to meet the needs, and achieve improved production safety, convenient operation, and high comprehensive performance. Effect
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[0018] Example 1: Steel plate coated with zinc-nickel alloy nano film on the surface
[0019] The specific steps are: before the steel plate is electroplated, the parts are polished and washed with water, degreasing, then washed with water, rusted, and then washed with water, and then put into the plating bath of the electroplating tank, and the electrolyte is stirred or left to stand. After electrolysis, the parts are removed from the electrolyte, washed with water, and dried. The pH value of the plating solution is 3.5, and the power supply mode for plating is pulse power supply for 25 minutes.
[0020] The electroplating power supply mode is output pulse power supply. The specific parameters are: the current density continuously decreases gradually from the initial 8A / dm2 to 1A / dm2; the frequency continuously decreases gradually from the initial 1500Hz to 400Hz. ; The duty cycle gradually decreases continuously from 0.5 to 0.05 at the beginning. The temperature is room tempera...
Example Embodiment
[0021] Example 2: Screw cap coated with zinc-nickel alloy nano film on the surface
[0022] The surface electroplating method of the nut includes polishing and water washing, degreasing, and then washing and rust removal of the parts of the nut before electroplating, and then putting it into the electroplating bath of the electroplating tank after washing, and stirring the electrolyte Or let it stand, and after electrolysis, take out the parts from the electrolyte, wash them with water, and dry them. The pH value of the plating solution is 3.5, and the power supply mode for plating is pulse power supply for 20 minutes.
[0023] The electroplating power supply mode is output pulse power supply. The specific parameters are: the current density continuously decreases gradually, from the initial 8A / dm2 to 2A / dm2; the frequency continuously decreases, from the initial 1500Hz to 500Hz. ; The duty cycle decreases continuously and gradually decreases from 0.5 to 0.1 at the beginning. The...
Example Embodiment
[0025] Example 3: Pump chamber lining coated with zinc-nickel alloy nano multilayer film on the surface.
[0026] The surface electroplating method of the lining of the pump chamber includes polishing, washing, degreasing, and then washing, rust and corrosion of the parts before the lining of the pump chamber is electroplated, and putting it into the electroplating bath after washing with water, and Stir or stand the electrolyte, remove the parts from the electrolyte after electrolysis, wash them with water, and dry them. The pH value of the plating solution is 3.5, and the power supply mode for plating is pulse power supply for 30 minutes.
[0027] The electroplating power supply mode is output pulse power supply. The specific parameters are: the current density continuously decreases gradually from the initial 9A / dm2 to 2A / dm2; the frequency continuously decreases gradually, from the initial 2000Hz to 500Hz. ; The duty cycle decreases continuously and gradually decreases from 0....
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