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Phospate for satin finish grey on low carbon steel?

Phospate for satin finish grey on low carbon steel?

Phospate for satin finish grey on low carbon steel?

(OP)
Customer has asked that we change from clear zinc finish to a satin-finish with uniform grey appearance. This is a welded lever arm that cannot be painted so I search for new process. I like the gloss finish black from salt-nitride or waxed black-oxide myself but customer is always right.

From my searching, both zinc and manganese phosphate coatings can produce components with grayish velvet finish. I ask:

Is this process going to be uniform at 1000 pcs per batch, 5-10 batch per year? How should I specify this to achive desired neutral reflectivity (% compounds, time in bath, etc.?)

Any other process can be done cheaply in PRC or ROC to get desired conversion-type finish?

Thanks,
Alex

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