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The Key Function of Organochemical Silane Coupling Agent in Galvanizing


Galvanizing is one of the key methods for the safety protection of steel surfaces all over the world at this stage. Galvanized thick steel plates are widely used in the automotive industry, household appliances, engineering construction and aviation industries because of their excellent corrosion resistance. However, the galvanized layer is very easy to corrode in the air or in the wet and cold natural environment, resulting in white corrosion substances, harming the appearance, and reducing the anti-corrosion work ability. The emergence of organosilane coupling agents has solved the above problems to a certain extent.


1. Organosilane coupling agent is a new anti-corrosion process


In order to better reduce the corrosion depth of the galvanized layer and increase its service life, the galvanized layer needs to be solved by surface passivation to improve its corrosion resistance. Chromium trioxide passivation is widely used in the passivation of metal materials because of its simple processing technology, low cost, and excellent passivation effect. Little do they know that Cr6 is a toxic chemical substance, a carcinogen, and a serious threat to the body and the natural environment.


At this stage, all parts of the world have just begun to take certain effective measures to strictly limit the application of Cr6, and the development and design of new chromium-free and environmentally friendly surface passivation processing technology for metal materials has long been highly valued. In recent years, organosilane coupling agent on the surface of metal materials is a new type of anti-corrosion process, because the processing technology has zero pollution and excellent corrosion resistance of the sample, and it has become a scientific research network hotspot of chromium-free passivation on the surface of metal materials.


2. The role of organosilane coupling agent in galvanizing


The passivation process of silane coupling agent is based on a silane test reagent that can hydrolyze and react to form silanol (-Si-OH). The organic chemical silane film, this film can have excellent anti-corrosion effect. According to reference reports, the actual effect of BTSE series product silane on metal materials anti-corrosion is very different from that of chromium trioxide, but the preparation of its passivation solution is complicated, and the re-spraying performance of the sample after the solution is not satisfactory. That is, the adhesion of the paint on the surface of the sample is not good, which seriously harms the post-production processing and industrial production application of the sample. In the experiment, vinyl tri-tert-butyl silane coupling agent was used to passivate the galvanized thick steel plate. The material test results showed that the corrosion resistance of the sample was greatly improved after passivation by the silane coupling agent, and the re-spraying performance of the sample was excellent.


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