Galvanization is one of the important methods for surface protection of steel both domestically and internationally. Galvanized steel plates are widely used in fields such as automotive manufacturing, home appliances, construction, and aviation due to their excellent corrosion resistance. However, the galvanized layer is prone to corrosion in air or humid environments, producing white corrosion products that affect its appearance and reduce its corrosion resistance. In order to slow down the corrosion rate of the galvanized layer and extend its service life, the galvanized layer needs to undergo surface passivation treatment to improve its corrosion resistance. Chromate passivation is widely used in metal passivation treatment due to its simple process, low cost, and good passivation effect. However, Cr6+is a highly toxic substance with carcinogenic properties, seriously endangering human health and the environment.
At present, countries around the world have begun to take measures to strictly restrict the use of Cr6+, and the development of new chromium free and environmentally friendly metal surface passivation processes has received widespread attention. In recent years, metal surfacesOrganosilaneCoupling agent is a new type of anti-corrosion treatment process, which has become a research hotspot for chromium free passivation of metal surfaces due to its pollution-free nature and good corrosion resistance of treated samples.silane coupling agent The passivation process is based on a silane reagent (formula X-R) that can hydrolyze to form silanol (- Si OH)′-Si(OR″)n， Where X represents the organic functional group R′，R″ When the metal sample is immersed in a silane passivation solution, a dense organic silane film will form on the surface of the substrate metal, which can have a good anti-corrosion effect. According to literature reports, the anti-corrosion effect of BTSE series silane on metals is comparable to that of chromate. However, the preparation of its passivation solution is complex, and the recoating performance of the treated samples is not satisfactory, that is, the adhesion of the paint on the surface of the samples is poor, which seriously affects the subsequent processing and industrial application of the samples.
The experiment uses vinyltrimethoxysilanecoupling agentPassivation of galvanized steel plate, the test results show that the corrosion resistance of the sample is greatly improved after passivation with silane coupling agent, the passivation film is dense, and the recoating performance of the sample is good.
