By understanding the principle or mechanism of silane treatment agent, it is helpful for us to understand how silane treatment agent can prevent metal surface from corrosion. Speaking of anti-corrosion mechanism, the principle of silane is different from that of chromium passivation. The working principle of chromium passivation is to change the electrochemical properties of oxide layer on metal surface to prevent metal corrosion. The working principle of silane is that it does not directly affect the properties of metal oxide layer. It mainly prevents metal corrosion by controlling corrosion points. Here is an example from Huiwei Jia Xiaomei.

After silane treatment, the corrosion medium produced by the corrosion point is firmly covered under the interface layer and can not move and diffuse because the silane interface layer is closely bonded with the metal surface, so that the silane treatment has time to repair and passivate again, in order to prevent metal corrosion.