CORROSION RESISTANCE OF POWDER COATING WITH USE OF FERRITIZATION WASTE
DOI:
https://doi.org/10.31650/2786-6696-2023-4-49-55Keywords:
powder coating, ferritization waste, peeling, width of metal corrosion, class corrosion.Abstract
Aspects for increasing the corrosion resistance of powder coating materials as a result of the involvement of the latest technologies for cleaning electroplating production waste are considered. The results of the effect of ferritization waste on the formation of corrosion resistance of coatings based on powder coating are shown.
The introduction of the obtained ferritization waste into the composition of powder coating systems has a different effect on the formation of corrosion resistance of coatings was found. Thus, the control composition of the powder coating using a filler in the form of barium sulfate during 480 hours of exposure in the salt fog chamber is characterized by peeling of the coating at the level of 7.5 mm. The average width of metal corrosion is 5.5 mm. The category of corrosion resistance of the coating corresponds to class C3 (average) with the provision of an average durability class (M) from 7 to 15 years. Examples of typical environments (according to DSTU ISO 12944-2:2019) where the resulting coatings can be used are urban and industrial atmospheres, moderate sulfur dioxide pollution, coastal areas with low salinity.
The use of galvanic waste sediments in general contributes to increasing the corrosion resistance of the powder coating. The efficiency of their use depends on the chemical composition of ferritization waste. Among the studied samples, the most effective is the introduction of waste in the form of Ni0.5Cu0.5Fe2O4 and Zn0.5Cu0.5Fe2O4 into the composition of powder systems, which helps to reduce the width of coating peeling by 65...79 %, as well as the width of metal corrosion by 75...80 % compared to the control composition.
The least effective among the studied samples is the use of waste in the form of Ni0.5Zn0.5Al0.15Fe1.85O4 and CrFe2O4 due to a significant decrease in the corrosion resistance of the powder coating
Powder coating systems were obtained using ferritization waste, the category of corrosion resistance of which corresponds to class C4 (high) with a high durability class (H) from 15 to 25 years. In general, the use of ferritization waste provides better corrosion resistance of coatings compared to traditional systems based on barium sulfate, which in turn gives reason to consider such systems as an alternative for corrosion protection of construction metal products and structures.
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