Trivalent chromium passivation
Trivalent chromium passivation is primarily a post‑galvanizing treatment for workpieces, and it has been widely adopted due to its mature and stable performance, low cost, diverse formulations, and excellent corrosion resistance.
Advantages of trivalent chromium passivation:
l Free of hexavalent chromium, suitable for both manual and automated production lines.
l The passivation film has a dense structure; after passivation, it exhibits a bright, eye-catching color and excellent corrosion and heat resistance.
l The passivation time is relatively long, requiring a thicker zinc coating.
l Excellent adhesion; no film peeling occurs.
l Stable solution, easy to handle, low cost
l The duration of the neutral salt spray test exceeds 720 hours.
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