Type and Development Trend of Environmental Protection Metal Table Front Treatment Technology
Date:
2020-05-06
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
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, 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 prospect
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.
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