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Tuesday, 17 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Nano-silica effects corrosion behaviour of silicate conversion coatings

Friday, 6 June 2014

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.

Researchers optimised the ratio of nano-silica/potassium silicate to improve the corrosion protection Source:vladimirkim3722-Fotolia.com

Researchers optimised the ratio of nano-silica/potassium silicate to improve the corrosion protection Source:vladimirkim3722-Fotolia.com

Iranian researchers optimised the ratio of nano-silica/potassium silicate in order to obtain higher corrosion protection. Thex examined the corrosion behaviour of coatings by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques.

Resistance increased with increasing silica ratio

The corrosion resistance 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 60s, the charge transfer resistance increased. Energy dispersive X-ray analysis shows silica ratio increasing in silicate coatings.

The study is published in: Materials and Corrosion.

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