Characteristics and use precautions of chromium-free passivator for aluminum alloys

Date:

2020-12-20

The research and development of chromium-free passivator for aluminum alloy can be divided into three categories: inorganic salt passivation, organic passivation and organic-inorganic composite passivation. In previous studies, molybdate, which belongs to chromium, was used instead of chromate, and subsequently tungstate, rare earth salt and silicate were developed, but their corrosion resistance could not meet the requirements of practical applications. Subsequent research and development focus shifted to organic passivation with good corrosion resistance such as phytic acid and tannic acid. Although the organic passivation film has good corrosion resistance, the high temperature resistance and adhesion are not good, and the comprehensive performance evaluation is still not ideal. It is precisely because inorganic salt passivation and organic passivation are not satisfactory, more and more R & D workers believe that organic-inorganic

The research and development of chromium-free passivator for aluminum alloy can be divided into inorganic salt passivation, organic passivation and organic passivation.-Inorganic composite passivation three categories. In previous studies, molybdate, which belongs to chromium, was used instead of chromate, and subsequently tungstate, rare earth salt and silicate were developed, but their corrosion resistance could not meet the requirements of practical applications. Subsequent research and development focus shifted to organic passivation with good corrosion resistance such as phytic acid and tannic acid. Although the organic passivation film has good corrosion resistance, the high temperature resistance and adhesion are not good, and the comprehensive performance evaluation is still not ideal. It is precisely because inorganic salt passivation and organic passivation are not satisfactory, more and moreR＆DWorkers think organic-Inorganic composite passivation has the advantages of both organic passivation and inorganic passivation, and effectively makes up for their shortcomings. Organic-Inorganic composite passivation system will become the mainstream of development and application of chromium-free passivator for aluminum alloy.

1.Product Features:

This product is a chromium-free acidic surface treatment agent for aluminum alloys, which can effectively replace the trivalent chromium surface treatment that pollutes the environment. And a similar corrosion resistance can be achieved. Aluminum alloy chromium-free passivator helps to improve coating adhesion, neutral salt spray up96H. It is widely used in furniture, electronics,3Cand other product areas.

2.Product composition: Activator is mainly composed of corrosion inhibitor, fluoride and auxiliary salt.

3.Process flow: oil removal-Wash-passivation treatment-Wash-Drying

4.Process parameters: (1) Use concentration:10-25％。（2) Use temperature: normal temperature-40In winter low temperature areas, the temperature of the treatment liquid should be properly guaranteed. (3) Usage time:20Seconds-3Minutes. (4) Operating parameters: pH3.0-5.0

5.Instructions for use:1.The chromium-free passivator for aluminum alloys will be treated with solutions of different concentrations according to the different performance requirements of aluminum alloy materials.2.This product is acid corrosion agent, please do a good job of protection, avoid direct contact with the skin, the best in the operating room with ventilation equipment. Grooving is best usedPPPlastic tank body.3.Avoid storing chromium-free passivators for aluminum alloys with alkaline items that may cause deterioration of the product. Aluminum and aluminum alloy workpieces can obtain uniform colorless and transparent chemical conversion film, with excellent anti-corrosion performance, decorative and anti-discoloration ability.

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