Nickel-tungsten Alloy Plating Mold Analytic Process(c)

It was also found: the plating current distribution directly affect coating uniformity. The edge of the mold, the corner portion, R at the current density was significantly higher than other parts, and accordingly the amount of metal deposition, large coating thickness. Under normal circumstances, the coating thickness difference of the central and side corners, R at about 4μm. Current lead to uneven distribution of coating thickness difference reaches more than 15μm, severe because of local metal deposition coating amount excessive shedding.
    
Further, the mold shape, structure, material and the like also affect the coating quality.
    
Countermeasure
    
(1) Before blasting, inspection, eliminate trachoma mold matrix, porosity, pitting corrosion, adhesion and the like.
    
(2) When the first test blast sandy, if impurities, foreign matter, oil and other pollution, should be completely replaced immediately. Timely cleaning the mold surface remaining after blasting grit and other adhesive material.
    
(3) In addition to the oil before the oil to the surface inspection, if oil emulsifier gather timely spray to break up; if the mold surface after degreasing oily emulsion adhesion, must be clean.
    
(4) Acid activation time must be strictly controlled to avoid excessive corrosion die; at the same time, under good control mold groove depth, to prevent the electrode plates, connectors and other corrosion. Their corrosion will contaminate the bath, resulting in poor plating.
   
(5) When the bath preparation of high purity chemicals as much as possible, and timely analysis of impurities. In addition, the bath to regularly analyze, filter, and change them regularly.
    
(6) The shape of the mold structure, scientifically-designed according to current balance board can effectively suppress local deposition of metal is too thick, the coating quality assurance.
    
(7) Ensuring the mold production process to meet the premise of mold design optimization, particularly conducive to improve the coating quality.
    
(8) Replenish the anode, repair accessories, regular cleaning of the plating tank sludge, and "three wastes" comprehensive way.
    
(9) Purification, protection of the environment, comply with the technical rules, strengthening the operator responsible, to avoid environmental, mechanical impurities into the bath.




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