Passivation is a post-treatment of the zinc surface. Specify the complete coating system, its appearance and the performance requirements for your component.
Colour does not define the complete specification
YTSAB offers blue, yellow, black and clear passivation. Include the required finish, an appearance reference and any restrictions on chemical content. Do not infer a particular chemistry or corrosion performance from a colour name alone. A requirement for a chromium(VI)-free system must be stated and confirmed separately.
Zinc passivation and black oxidation are different
Black-passivated zinc is not the same process as black oxidation of steel. If an old drawing only specifies “black”, ask the responsible designer to clarify the intended coating before ordering.
Information for a quotation
Provide the steel specification, strength information, drawing revision, zinc thickness requirements, critical dimensions and required passivation. Include the applicable standard and edition, inspection areas, test requirements, quantity and packing needs.
Testing and acceptance
Define the test procedure, exposure period and acceptance criteria for the actual product. State how contact points and edges are assessed. A general product description is not a substitute for the inspection plan agreed for your order.
Read about zinc plating, salt spray testing and our zinc coating standards guide (Swedish).
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