Type and Development Trend of Environmental Protection Metal Table Front Treatment Technology

Date:

2020-04-15

For a long time, if some workpieces of household electrical appliances have higher requirements for anti-corrosion, the current common solution is to use a chemical and electrochemical reaction to form a phosphate chemical conversion film in the metal coating pretreatment process (this process is referred to as phosphating, and the phosphate conversion film formed is called phosphating film), it protects metal products such as home appliances together with post-coating to ensure that problems such as rust will not occur for 10 years or more. Although phosphating has excellent corrosion resistance and other properties, it also produces many problems, such as high energy consumption, serious pollution, containing harmful heavy metals, difficult wastewater treatment, easy to be in the pipe wall.

Although phosphating has excellent corrosion resistance and other properties, it also produces many problems, such as high energy consumption, serious pollution, containing harmful heavy metals, difficult wastewater treatment, and easy slagging on the pipe wall and pipeline. With the continuous progress of science and technology and the continuous improvement of environmental protection requirements, more environmentally friendly metal surface treatment process is being developed worldwide. At present, the research work in this area is focused on the new process of non-toxic and environmentally friendly phosphating and completely abandoning phosphorus-containing formulations.

Development course of phosphating and environmentally friendly non-toxic process

Industry experts said that as people pay more and more attention to environmental protection, environmental protection painting has become a trend and development direction to replace traditional painting, and this development speed is getting faster and faster with the maturity of China's home appliance industry. Liu Wanqing said that in the past one or two years, domestic home appliance companies have generally increased their awareness of environmental protection, and their acceptance of environmentally friendly coating pretreatment processes has greatly increased. It is expected that in the next 2 to 3 years, phosphating alternative treatment processes will replace traditional processes by 30% to 40%. Share.

'Although silane and other nano conversion film is the next few years to replace phosphating ideal process, but it is not the end of the development of coating technology. Chen Sheng, sales director of Shanghai Kemitel Chemicals Co., Ltd., believes that whether it is a car body board or a home appliance board, the current coating process is generally: degreasing, phosphating pretreatment, and electrophoresis. However, in the process of continuous development and maturity of new technologies, the new coating process will change to: degreasing, nano-conversion film, and electrophoresis. With the continuous development of science and technology, people are always looking for simpler, shorter and more economical processing methods. Scientists are at the forefront of technological development. Pre-processing companies such as Kemitel have begun to work on a new 'two-in-one' technology. This new technology can simplify the coating process to: degreasing, 'two-in-one' coating.

This 'two-in-one' process combines metal pretreatment and electrophoresis into one, simplifies the coating process, reduces the operation steps, reduces the number of equipment and covers an area, and is also feasible in the technical realization. It is a promising development trend in the coating industry.

Anti-corrosion heat dissipation coating to enhance the extreme anti-corrosion heat dissipation