Abstract
Nano‐silica potassium silicate conversion coating was deposited in different silica ratio on the surface of hot‐dip galvanized (HDG) steel as an anti‐corrosion coating. The ratio of nano‐silica/potassium silicate has been optimized in order to obtain higher corrosion protection. The corrosion behavior of coatings was examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques. The corrosion resistance was increased with increasing silica ratio of silicate coatings. This can be related to the size of nano‐silica particles and the ability to fill the pores in potassium silicate coating. SEM images in agreement with the electrochemical results indicated that the coating obtained from silica ratio 3 was more homogeneous and without pores. Electrochemical impedance data shows that with increasing immersion time up to 60 s, the charge transfer resistance increased. Energy dispersive X‐ray analysis shows silica ratio increasing in silicate coatings.
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