The hottest silane technology is expected to repla

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Silane technology is expected to replace the traditional phosphide metal surface treatment

silane technology is expected to replace the traditional phosphide metal surface treatment

January 2, 2008

[China paint information] a new surface treatment technology - silane technology can realize the coating process without phosphorus, nickel, manganese, chromium and other heavy metals, eliminate nitrite carcinogens, and reduce energy consumption, It brings good news to realize the environmental protection goal of phosphorus free and heavy metal free coating surface pretreatment. With its further maturity and improvement, silane surface technology will bring significant changes to the traditional phosphating surface treatment technology. This was learned from the second symposium on electrophoretic coating technology and application held in Hangzhou on December

according to Chen Muzu, a distinguished expert of the Chinese society of automotive engineering, phosphating technology is widely used in domestic coating surface pretreatment, while the silane surface treatment technology of German kemitel company and American Ecotech company has been widely used in Europe and the United States. Silane technology uses ultra-thin organic coating to replace the traditional crystalline phosphating protective layer, adsorbs an ultra-thin organic coating with three-dimensional structure similar to phosphating crystal on the metal surface, and has good adhesion with the metal substrate and coating. This technology has the irreplaceable advantages of phosphating technology, such as environmental protection, energy saving and simple operation. For example, it does not need to control the content and temperature of free acid, total acid, accelerator, zinc, nickel and manganese like phosphating solution; It can be operated at room temperature or low temperature with low energy consumption; At the same time, it can be compatible with the existing coating process and equipment that can last for several months or even several years. There is no need to carry out equipment transformation, and it can be put into production only by changing the phosphating solution. With the depletion of phosphorus, nickel, zinc and other resources, as well as the restrictions on the use of nickel salt in phosphating tank solution, China has implemented cleaner production and coating standards for automobile manufacturing since December 1, 2006, and has made various restrictions on phosphating solution, such as no nitrite and heavy metal pollutants, low temperature and low solid slag, etc., which have created conditions for the promotion and use of silane technology in the automotive industry. At present, this technology has gradually replaced iron and zinc phosphating in the general industrial field, and its application in the automotive industry is under development and testing

According to Wang Yijian, general manager of Hangzhou Wuyuan science and Technology Industry Co., Ltd., the cost of environmental protection treatment accounts for 30% - 40% of the production cost of existing surface treatment. Many coating enterprises urgently need to innovate or seek alternative technologies for surface treatment technology due to the pressure of environmental protection. According to the statistics of China Automobile Industry Association, in 2007, China's automobile sales volume was more than 8 million. If the average price was 100000 yuan/vehicle, the total sales volume was 800 billion yuan. According to the coating cost accounting for 3% of the vehicle price, such high modulus counterpoint could only produce yellow products in the past, it was 24 billion yuan, and the previous treatment cost accounted for 10% of it, it was 2.4 billion yuan. If silane technology was used, the investment in coating equipment could be reduced by 30%. At present, Hangzhou Wuyuan Technology Industry Co., Ltd. has applied this technology to the coating of auto parts, fire extinguishers, solar water heaters, household appliances and aluminum profiles

the new silane technology has also attracted great interest from downstream users of electrophoretic coatings. Liguobo, the director of the coating workshop of Chery Automobile Co., Ltd., believes that it is a very attractive technology, but whether it has the stability required by the large-scale application of automobile industrialization, as well as the management difficulties of implementing the new process and the value of transforming the original traditional coating process, are issues of great concern to automobile coating enterprises. Ma Chunqing, deputy director of the Institute of process materials of China YITUO Group Co., Ltd., also believes that any new technology needs to go through a process of continuous promotion and improvement. After further promotion and application and the test of specific application practice, the stable, mature and perfect silane technology will likely replace the traditional phosphating technology

it is understood that electrophoretic coating itself is an environment-friendly water-based coating, but due to its high requirements for the surface to be coated, it is necessary to degrease, water wash, phosphatize and passivate the metal surface before electrophoretic coating, and the quality of surface treatment can directly affect the final coating effect of electrophoretic paint to meet the requirements of different output. Participants believed that pretreatment played a crucial role in ensuring the quality of electrophoretic coating, accounting for 50% to 60%. Although phosphating technology has made some progress in recent years, it still has some defects, such as high energy consumption, high content of heavy metal nickel, manganese and chromium, carcinogens, affirmation of solidification process before and after waste, automatic paving, standardized molding process, and excessive discharge of water and waste residue

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