Letter 36007

STEP test problem in Duplex Ni Plating Plant  

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We are not achieving Potential Difference ( STEP Value ) between two layers of Nickel - Semi Bright and Bright . The solution is already purified by Carbon , High pH ,Oxidation treatment. Sulphur content in Semi Bright is 0.002 % and )0.04 %in Bright solution. Request ur advice.

A.K.Kansal
- India

The pH of the semi bright nickel should be 0.5 lower than the bright nickel.

Sara Michaeli     chemical process supplier Israel

Hello Sara,

We have gotten used to mantaining the same pH in both baths on account of adhesion issues with the lower pH in the SB.

Khozema Vahanwala Automaxx   Bangalore, Karnataka, India

You can operate your SB at PH-4 and your bright nickel at 4.5.
I still cannot understand what does it have to do with adhesion.

 
Sara Michaeli
    chemical process supplier
Israel

Hi There,

If Everything is in order as termed to ph , sulphur content , temp, bath chemistry , then the things wrong may be with the additives used in semibright nickel, request for a special additive to increase the potential difference in semibright nickel just check in hull cell adjusting the make up and maintenance additives, please also look for the rinses and filtration before semibright and try to improve filtration in semibright.
Regards,

Praveen Kumar     plating process supplier Mumbai, India

Dear sir,
Only sulphur is not criteria you need to check Impurity level as well .Step is mainly depends on semibright as well as bright additives.Talk to your supplier.

Vishwas Nangare motorcycle accessories mfgr. - Aurangabad, Maharashtra, India

dear sir,
first u see in hullcell panel,it must be semi bright effect(HCD dull LCD little bright).if it is totally bright than pls. add STEP bosster with initial additive.dont use maintaince additive till semibright effect u get.& continous run filter with carbon.
it is definetly give u best result with STEP TEST.


THANK'S
VIJAY

vijay parmar
- mumbai,maharashtra,india

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