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Nickel Plating Low Current Density Rough Problem

2005

I'm doing nickel plating (watt solution) with horizontal barrel plating equipment. I'm facing rough plating at low current density area, I'm plating safety pin and having 'On' and 'OFF' problem on "touch mark" problem. Touch mark: point where the pin and the head touching together, as the tip of the pin covered by the head the area should be low current density, rough detected at this area and the touching point will have a mark (dent).
Hull cell test shown good result at LCD however the problem keep happening "On' and "Off". Actual product are plated at 8 - 9 volt, however hull Cell test voltage only at 3.0 V (1.0 A), It is possible for me to purposely increase the voltage during hull cell test to 8 - 9 V as to reflect the actual process? Is there any critical parameter I should control as to minimize or eliminate this problem?

Maui
- Kuala Lumpur, Malaysia

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Mr. Maui,
You can check current density on panel only, in barrel we are applying high voltage because of low current passage through dangler & barrel holes , you have to check barrel capacity whatever you are considering roughness that may be current burning at the edges,So check voltage on meter & also check with multimeter at field.
Check results by reducing voltage.

Vishwas Nangare
motorcycle accessories mfgr.
- Aurangabad, Maharashtra, India
2005