On the issue of studying the corrosion resistance of zinc coatings, including their additional treatment with passivation and paint and varnish material

This paper presents a brief review of the results previously obtained by the authors in their studies of the chemical and granulometric composition of zinc‑containing dispersed waste (zinc dust) generated during the galvanizing of pipes and subsequent steam blowing. It also examines the influence of technological parameters such as the mixture composition and the temperature of thermodiffusion galvanizing on the thickness, structure, and properties of zinc coatings produced using thermodiffusion galvanizing in saturating mixtures based on zinc‑containing waste. Since the primary function of zinc coatings is corrosion protection, samples of zinc coatings based on both standard zinc powder and production waste were fabricated ina rotating container unit for comparative corrosion resistance testing in a salt spray chamber. It is well known that to enhance corrosion resistance, zinc coatings are commonly passivated and coated with paint materials. Some of the zinc‑coated samples were also subjected to additional treatments. The comparative salt spray chamber testing (ongoing at the time of writing) revealed that after 300 hours of exposure, the coatings produced from zinc‑containing waste only slightly underperformed in terms of protective properties compared to those made with standard zinc powder. Additional treatments, specifically passivation, nearly eliminated white rust formation. Furthermore, the use of a combined paint coating system (passivation + painting) ensured complete corrosion resistance for no less than 300 hours in the salt spray chamber.

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