Critical Issues for Chrome-free Pretreatment of Aluminium Alloys
Critical Issues for Chrome-free Pretreatment of Aluminium Alloys
Critical Issues for Chrome-free Pretreatment of Aluminium Alloys
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<strong>Critical</strong> <strong>Issues</strong> <strong>for</strong> <strong>Chrome</strong>-<strong>free</strong> <strong>Pretreatment</strong> <strong>of</strong> <strong>Aluminium</strong> <strong>Alloys</strong><br />
Alloy Processing<br />
• Cold rolling can progressively reduce the thickness <strong>of</strong> the de<strong>for</strong>med surface<br />
layer and this can reduce susceptibility to fast fili<strong>for</strong>m corrosion<br />
• Resistance to corrosion can be improved by increasing the transfer gauge<br />
thickness<br />
• An alternative route is to heat treat rolling blocks to precipitate manganese<br />
be<strong>for</strong>e hot rolling. The alloy then behaves like an alloy with a lower<br />
manganese level.<br />
International Conference on Environmental friendly <strong>Pretreatment</strong>s fo <strong>Aluminium</strong> and other Metals, Oslo, Norway, June 16-18, 2004
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