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Date: Tue, 10 Mar 98 19:48:55 EST
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To: "charles''"<charles>, [log in to unmask]
Subject: Grainy copper deposit.
dear Mr.charles,
thank you for the reply,following are the information regarding
plating process.
additive ...copper gleam 125 T,LEA RONAL.4-5 ML/LTR
suggestion 7.5-10 ml/l
copper sulfate...75-85g/l
sulfuricacid...100-110ml/l
chloride...50-60ppm.
this problem started when we attempt to raise additive content
from 5ml/l to 7.5ml/l.this problem appeared,one week after the
addition of extra brightener.7.5 ltr brightener added at a time
to 4 copper tanks of 3000 ltr each.(7.5ltr/tank.).
IN the beginning we suspeccted organic contamination,& anode sludge.
carbon treatment done,anode baskets cleaned.
again we try maintain additive at 7.5ml/l as per vendor suggestion.
cvs used to analyse addditive content.
after one week GRAINY COPPER reappeared on the panels,since hard
deburring did not help & have to scrap beacause of cosmetic.
Since 125 T is one component (pre mixed leveller,brightener,&carrier)
vendor did not help on analysing it seperatly.
This grainy copper repeated atlest 5 times,eventhough sometime no
addition (additive) made.
since vendor did not help much on this ,I used stop addition of
brightener ,atlest 2 shift,to stop this problem.vendor reply is
our predip acid copper is high.
this grainy copper most of the time on highcurrent area.
The current density in use 1.5 to 2.1
the panels with 1.8to 2.1 ASD normally get this problem.
anode balls of 1" dia are being used.
thanks & expecting a Positive reply to understand 125T.
padmanabha.A,H.
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