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Please applied a anodic current to your stainless vessel .the dark material may be nickeloxide combined with nickel powder .If you applied current ,it will stop bubbling. By normal case ,If you see the dark powder ,your system is not stable.the reason may be : Unstable chelating system in nickel bath , powdery substrate like Mg alloy ,unstable pd catalyst for pretreatment .Hot plate's overheating |
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