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Sunday, 22 September 2019
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Raw materials & technologies, Applications, Automotive coatings

Non-toxic pre-treatments protect magnesium and aluminium alloys

Friday, 2 March 2012

New protective systems with self-healing ability have been developed, that are based on salts of Ce, Sn, V, Si, Zr or Mo

High strength aluminium alloys are widely used in automotive and aerospace applications, but they are highly susceptible to corrosion

Source: Cornelia Hoffmann - Fotolia.com
High strength aluminium alloys are widely used in automotive and aerospace applications, but they are highly susceptible to corrosion Source: Corn...

High strength aluminium alloys are widely used in automotive and aerospace applications, but they are highly susceptible to corrosion, as are the even lighter magnesium alloys. Both are excellent materials for reducing weight, fuel consumption and therefore CO2 emissions.

Hexavalent chromium has provided the most effective conversion coatings for these materials but its carcinogenic effects and problems in waste disposal mean that replacements are essential. Most replacements require multiple steps, sophisticated equipment and expensive raw materials. A range of new protective systems with self-healing ability has been developed, based on salts of Ce, Sn, V, Si, Zr or Mo. When applied prior to an organic top coating, the coatings resist more than 2,000 hours in salt spray tests.

A paper on these systems can be found in the March issue of the European Coatings JOURNAL

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