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Passivators combined with chromates

Zinc polyphosphate has also been used successfully as a passivating agent, often in combination with chromate. The zinc is a cathodic... [Pg.338]

The mechanism by which chromate passivates steel has been studied extensively, and it appears hkely that protection is afforded by a combination of adsorption and oxide formation on the steel surface. Adsorption helps to polarize the anode to sufficient potentials to form very thin hydrated ferric oxides that protect the steel. Because the oxide film is invisible on steel, articles protected by chromate remain bright in otherwise aggressive environments. The oxide film is a mixture of ferric and chromic oxides and is kept in good repair by adsorption and oxidation, with very little loss of metal as long as sufficient chromate remains in solution. [Pg.129]

See other pages where Passivators combined with chromates is mentioned: [Pg.456]    [Pg.485]    [Pg.375]    [Pg.1191]    [Pg.502]    [Pg.531]    [Pg.121]    [Pg.196]    [Pg.1224]    [Pg.66]    [Pg.203]    [Pg.221]   
See also in sourсe #XX -- [ Pg.309 ]



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Chromate passivator

Passivators chromates

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