Research On The Silanization Treatment Of Carbon Steel

As one of the most important materials, steel used in our life widely. When steel in different environmental media, it will be damaged by corrosive medium more or less. Because of the corrosion of steel would cause huge economic losses on people’s production and life, or even buried a serious security risk. therefore, the research and development of new steel protection technologies to mitigate and prevent corrosion of steel is a very rewarding job.Phosphate conversion coating and chromate conversion coating technology are the best technologies in the international metal surface protection field nowadays.But the two technologies is not adapt the development of modern industry because of their toxicity and high energy consumption. Silane treatment technology as a new and energy saving technology grows up fast. After nearly twenty years research and development,the silanization treatment technology of metal surface has made many important achievements, part of the technology has been applied in the industry of automotive coating production line.At present, the formation mechanism and structural characterization of silane film on metal surfaces has a lot of research, but the research on hydrolysis and failure of silane agent and surface modified has some success, but it needs to be further explored.In this paper,on the basis of previous studies, many questions and status that currently exist in silanization treatment process of steel surface have been studied. The hydrolysis conditions of Vinyltriacetoxysilane(VTAS) and double-triethoxysilane silylpropyl amine (BTSPA) applicable to steel and optimization of film-formation process conditions have been determined.Finally silane hydrolysis conditions which is suitable for steel is that the optimal hydrolysis conditions of BTSPA is content of silane 3ml,alcohol-water ratio 20:80,pH 6,temperature 35℃;The optimum hydrolysis conditions of the mixture of BTSPA and VTAS is content of silane 8ml,alcohol-water ratio 80:15,pH 4,,temperature 25℃.Film forming conditions were that the dipping time is 60 seconds,the curing temperature is 100℃ and the curing time was 30 minutes.