[China Aluminium Network] Chemical conversion film treatment is currently used in aluminum and aluminum alloy anti-corrosion surface treatment of a wide range of processes, more than half a century of the development of the chemical conversion film process is maturing, and continue to derive other new treatment method. Undoubtedly, chemical oxidation will still play an important role in the future. However, due to the increasingly serious environmental pollution, higher requirements have been placed on the cleanliness and non-pollution of the surface treatment process. This can be improved from the following directions.
1. Low-temperature metal surface pretreatment An energy-saving surface treatment process has been developed.
2, low chromium and chromium-free treatment.
3, waterless wash treatment: cancel the entire process of washing process, in addition to fundamentally solve the problem of environmental pollution caused by wastewater discharge, but also save water. Japan reported: Chromic acid type surface treatment agent, is a mixture of Cr3+, Cr6+ and water-soluble organic resin, used in aluminum plate, using spraying filming method, no need to wash, even if chromium ion does not pollute the environment; naturally dry, easy to close System treatment; film corrosion resistance and coating adhesion are the same as or better than those of past surface treatments.
4. The pre-treatment process and the film formation process adopt an inter-closed cycle mode, in which all chemical agents in the system are recycled, and do not need to replace the original liquid, but only periodically add the consumables; the water-washing treatment or the non-washing treatment can achieve the sealing. The closed process can greatly improve the on-site operation environment, reduce the discharge of waste slag and waste liquid, save energy and resources, and the economic and social environmental benefits are obvious.
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