Eletroplate commonsensible interlocution

Desquamate of gold plated film
Ask: We go up in light nickel plating 24K gold, but present question of desquamate of plating gold film periodicly. Intermittent fit, perhaps want a few only sometimes, but rectify a plating to taste sometimes desquamate, how can appear, seem and do not have sure regulation but abide.
Answer: Perhaps place of passivation of the nickel when cleanness forms this one doubt. The plating after you say plating nickel is tasted should put inside clean chamfer 4, 8 minutes. Below this kind of state, nickel will be appropriate significantly passivation. Say eccentric, winter passivation is normally more serious. Because of winter cleanness water-cooling, and microtherm can include more dissolved oxygen.
Similar situation causes chromium of the plating on burnish nickel to generate question normally. If you are indispensable so long placement always, can be in aureate before add a activation and cleanness. Appropriate activator is 15, 30% hydrochloric acid, probably 10% vitriolic, add some of monopolistic activation salt at the same time.

Copper, nickel, chromic
Ask: Our factory tries part of plating brass and cupreous group complex, electroanalysis abrade hind, flash cyaniding copper, 5um of plating burnish nickel, again plating chromic 0.25um. But although cleanness is wonderful, the plated film above copper as before desquamate.
Answer: What what you try plating is copper and the part that constitute brassily, the reason of desquamate is to electroanalysis there was copper in abrade fluid. Because acid perhaps did not suffer,restrain, deliquescent copper can be in clean process displacement film is made on copper, if is absent behind add a working procedure, electroanalysis instead in cyaniding natrium solution for example processing, get rid of this displacement film, criterion cupreous appearance is met desquamate.

Chromic plated film has rainbow multicoloured
Ask; How can rainbow appear after burnish nickel plating decorates chromium of multicoloured? How to avoid?
Answer: Chromium of burnish of the plating on nickel presents rainbow the reason of multicoloured, can be plating fluid inside lopsided (especially activator content is low) , temperature is incorrect; Probably nickel layer passivation. Sometimes, link up with plans to had been owed, form voltage to be no good, namely low voltage (the voltaic current-carrying capacity that is like structure of link up with or contact is no good) , also can present rainbow multicoloured.
Hasten after plating nickel clean, after cleanness at once plating is chromic, can avoid nickel passivation. Another method is appropriate activation next at once plating is chromic.

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