New silane coating technology creates revolutionary changes in coating pretreatment
a new silane coating technology with energy conservation, environmental protection, simple process and cost reduction will replace the traditional phosphating technology and be rapidly promoted in the pretreatment industry of metal surfaces such as automobile manufacturing. From May 25 to 27, at the 14th National coating technology information exchange seminar held in Xi'an, Chen Muzu, a Chinese automotive coating expert and professor level senior engineer of Shanghai kemitel Chemicals Co., Ltd., commented that silane coating technology is "a revolution in coating pretreatment technology that requires our region to develop and innovate products with better performance and cost advantages"
the surface of automobile steel plate must be pretreated before painting, and the electrophoretic coating must be firmly adsorbed on the metal surface like a "glue", which is the key to corrosion prevention. "European propo SA industry insiders said that the annual cost of using phosphating solution in the production line of L factory was 730000 euros, and the technical cost of safety rope/safety belt testing machine produced by silicon Shandong Sida high tech factory, which is specially used for safety belt tensile test, was reduced to 390000 euros." Chen Muzu told that compared with the traditional pretreatment phosphating process, the silane coating technology generally operates at room temperature without heating, and the process is simple, reducing surface conditioning, water washing, passivation and other processes. After degreasing and washing, an ultra-thin three-dimensional structure organic coating similar to phosphating crystal is formed, which is adsorbed on the metal surface. After treatment, electrophoresis is carried out directly without drying, which enhances the adhesion between the coating and metal plates, and the corrosion resistance of the coating is significantly improved
it is understood that the new silane coating technology has been applied in the automobile production lines of France, Spain, Brazil and other countries since 2009, and began to enter the fields of home appliances, auto parts, it, wind power generation and so on in China last year
it is reported that silane coating technology can greatly reduce the unit consumption of products. The ultra-thin organic coating film weighs only 0.1 g/m2, equivalent to 1/20 of the traditional phosphating process; The bath liquid is composed of two-component liquid, which only needs to control the pH value and conductivity, and does not need to control the parameters such as free acid, total acid, accelerator, zinc, nickel, manganese content and temperature like phosphating liquid; It saves the regular cleaning of phosphating slag in phosphating tank and pipeline and the use of a large number of cleaning chemicals. Since the meter adjustment, passivation and slag removal equipment (including phosphating storage tank) are no longer used, the power consumption is reduced by 40%; The processing time was shortened from 3 minutes to 1-2 minutes; Low operation cost and "three wastes" treatment cost. In addition, the silane coating technology is compatible with the original phosphating coating process and coating equipment. Without equipment transformation, it can be put into production by replacing the phosphating solution
at present, phosphating technology, which has been used for decades, is mostly used in the pretreatment of metal surfaces such as automobile manufacturing. However, the process flow is complex, and it needs to be heated to 35 ℃ ~50 ℃. The energy consumption cost is high, and the treatment of phosphating waste residue is difficult. And sodium nitrite as a promoter, easy to produce carcinogens, harm human health and environmental health
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