An alternative is zinc chromate. It looks like yellow cad, but is easier to have done as it is a less toxic process. In the US, it is hard to fine anyone that does cad, although that could well be different in Turkey. As an example, Eurometrix re-plates throttle body linkages and other hardware with zinc chromate.
-Scott
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'70 911E short stroke 2.5 MFI. Sold   
'56 Cliff May Prefab
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