44008

Cadmium plating [Pakistan] 

February 10, 2007

dear sir,
we are also doing non cyanide cadmium plating as per BAC 5701.problem we are facing is this that when we do plating it swells at once as we apply current.the ph of bath when we made it was 8 to 9.at that time plating was ok.now when we added furthuer cadmium oxide with hcl to clear the slurry.then its ph decreases.after this addidtion we faced problem.can any body tell me ph can effect cadmium plating so it swells or there is any other reason.and how i can correct it.

IFTIKHAR ALI
PIAC - PAKISTAN

What do you mean by "the plating swells"???

Also, as I remember, acid cad is not normally made up with HCl as the acid. Brighteners and levelers are very trickey for this bath and is why it has virtually gone out of commercial use.

James Watts
- FL

Dear James,
thanx for ur reply.infact my problems are as under,
1-we r doing non cyanide cadmium plating with requirement 10-20 amperes square feet.
when we do plating on part of 15-5 ph steels we experience burning on the lower edge of part.in addition the part edges become sharper and small particles become gather during plating .these particles are some metallic in type.due to sharp edges formation like burrs appears which are not acceptable to customers.please help me in this regard.
2-for gaining 10 amperes square feet or above we have to give voltage at 14 volts are higher due to high voltage racking wire become hot and burning appears .what should we do?
please guide me as soon as possible.
waiting for ur reply.

IFTIKHAR ALI
- KARACHI, SINDH, PAKISTAN