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Petroleum resistance of Cr3+ passivation

we are preparing components like pipe for petrol tank. which undergoes acid zinc plating followed by hexavalent chrome passivation. Now we are interested/ forced to replace the hexavalent chrome passivation to trivalent chrome passivation. Is the trivalent chrome passivation is petrol resistance. If not how to develop petrol resistance trivalent passivation?

Devid Desuza
Product designer, Buyer - Mumbai, India
April 30, 2011
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