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According to Chen Muzu, a special expert of the Chinese Society of Automotive Engineers, phosphating technology is commonly used for surface pretreatment of paints in China, and the silane surface treatment technologies of Germany's Kemitel and U.S. companies have been widely used in Europe and the United States. The silane technology uses an ultra-thin organic coating instead of the traditional crystalline phosphating protective layer to adsorb an ultra-thin organic phosphate-like, three-dimensional network-like organic coating on a metal surface, with a metal substrate and paint coating. All have good adhesion. This technology has the irreplaceable advantages of phosphating technology such as environmental protection, energy saving and easy operation. For example, it is not necessary to control the free acid, total acid, accelerator and the content of zinc, nickel, manganese, and temperature, etc. as phosphating solution; Or low-temperature operation, low energy consumption; at the same time with the existing coating process and equipment compatible, without the need for equipment transformation, simply replace the phosphating solution can be put into production. With the depletion of phosphorus, nickel, zinc, and other resources, and restrictions on the use of nickel salts in phosphating baths, China began to implement clean production and coating standards for the automotive industry from December 1, 2006 on phosphating. Liquids are subject to various restrictions, such as the absence of nitrite and heavy metal contaminants, and low-temperature, low-solids slags, all of which have created conditions for the use of silane technology in the automotive industry. At present, this technology has begun to gradually replace the iron and zinc phosphating in the general industry, and the application in the automotive industry is currently under development.
Wang Yijian, General Manager of Hangzhou Wuyuan Technology Industrial Co., Ltd. introduced that the cost of environmental protection accounts for 30% to 40% of the existing surface treatment production cost. Many coating companies urgently need to innovate or seek alternatives to surface treatment technology due to environmental pressures. technology. According to the statistics of China Association of Automobile Manufacturers, from January to November 2007, more than 8 million automobile sales were sold in China. If the average price is 100,000 yuan/vehicle, the total sales amount is 800 billion yuan, and the coating cost accounts for 3% of the entire vehicle price. In addition, the total cost was 24 billion yuan, of which the previous treatment cost accounted for 10% of the total amount was 2.4 billion yuan. If silane technology is used, investment in coating equipment can be reduced by 30%. Hangzhou Wuyuan Technology Industrial Co., Ltd. has applied the technology to the coating of auto parts, extinguisher cylinders, solar water heaters, home appliances and aluminum profiles.
The new silane technology has also aroused the interest of downstream users of electrophoretic coatings. Li Guobo, head of the paint shop at Chery Automobile Co., Ltd., believes that it is an attractive technology, but whether it has the requirements for large-scale automotive industrial vehicle applications Stability, and the implementation of the new process management difficulties and the transformation of the original traditional coating process is of value, is a matter of concern for automotive coating companies. Ma Chunqing, deputy director of the Technology Materials Research Institute 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 practical application tests, the stable and mature silane is stable. Technology will likely replace traditional phosphating technology.
It is understood that electrophoretic coating itself is an environmentally friendly water-based paint, but due to its high requirements on the surface being coated, before the electrophoretic coating, the metal surface needs to be degreasing, washing, phosphating and passivating, etc. Pretreatment, and the quality of the surface treatment directly affects the final coating effect of the electrophoretic paint. Delegates considered that the pre-treatment accounted for 50% to 60% of the quality of the electrophoretic coating and played an important role. Although the phosphating technology has made some progress in recent years, it still has the drawbacks of high energy consumption, high nickel, manganese, and chromium content in the heavy metals, carcinogens, and waste water discharge.
Silane Technology Brings Breakthrough in Painting Process
A new surface treatment technology - silane technology can achieve the coating process without phosphorus, without nickel, manganese, chromium and other heavy metals, eliminate nitrite carcinogens, while reducing energy consumption, in order to achieve the coating surface pretreatment Phosphorus-free heavy metal environmental protection goals bring good news. With its further maturation and improvement, silane surface technology will bring significant changes to the traditional phosphating surface treatment technology. This reporter learned from the second seminar on electrophoretic coating technology and application held in Hangzhou on December 18-19.