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Dark patches in EN Plating, and possibility of rework




August 8, 2011


Currently, we are trying to EN plating piece part (thickness 6mm, sized 2 ft by 4 ft) made from CRS, the outcome we saw was surface having dark patches.
Part requirement needs the parts to be bright.
We suspect the Ni deposit on the surface failed due to some contaminants still remaining on it, whereas the initial layer etched off causing these dark patches

I want to know how do we go about to reworking the plating on this part?

Question : What are the dark patches, is it oxidizied surface?
Question 2: How to rework to get bright and consistent finishing?

Baladewan Ganesan
Having parts with this issue - Seberang Jaya, Butterworth, Malaysia



CRS is very easy to prepare and highly receptive for EN. Just make sure it is absolutely clean (water break test) and free of oxides. Of course, make sure your bath chemistry is within your chemical vendorĘs specs.
G. Marrufo-Mexico

Guillermo Marrufo
Monterrey, NL, Mexico
August 9, 2011



August 9, 2011

Hi Bala.
It is fairly easy to plate EN on CRS. Recheck your EN and its operating conditions.
For rework, try polishing a small area of the dark patches with Autosol [on eBay or Amazon] . If OK, polish the rest of the area to the same shine. 2 ft x 4 ft is a fairly large area to polish , though, but at least it is one method of rework. Good Luck.

SK Cheah
- Penang, Malaysia




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