Cr(VI)-based treatments have historically played a very important role in the aircraft, marine, automotive and civil construction industries for corrosion resistance of different metals and alloys.

For many decades, chromate conversion coatings have been used effectively as a corrosion inhibitor as well as to create an interface compatible with a wide range of paints. The non-functional silanes (i.e., the silanes without the functional group) have been investigated for their use as cross-linking agents, and they do not provide good paint adhesion. The functional group Y can be, for example, an amine group or a chain of sulfur atoms. The organosilanes that have an additional Si atom linked to the trialkoxy group (X 3) on the other side of the functional group ( Y) and have the general structure X 3 Si( CH 2) nY( CH 2) nSiX 3 are called bis-silanes. In particular, this review provides insight into silane coatings for mitigating microbiologically influenced corrosion (MIC) of mild steel. The factors that influence the performance of the silane coatings for corrosion resistance of mild steel are discussed. This review discusses the critical mechanistic features of silane coatings such as the role of hydrolysis and condensation in the bonding of silanes with metal surfaces. Different approaches, such as adding particles of metal oxide (such as SiO 2, ZrO 2, Al 2O 3, TiO 2 and CeO 2), incorporating plant extracts and impregnating 2D materials into the coatings, have been employed for durable corrosion resistance, including for mitigating enhanced corrosion due to the presence of bacteria.

Under the tremendously increasing demand for improving the coatings strategies because of the environmental concerns due to some of the traditional coatings, silane pre-treatments have been emerging as one of the effective solutions, among other strategies. However, corrosion of mild steel in aggressive environments is a major concern. Mild steel continues to be the most extensively used construction material in several industries and constructions.

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