izvorni znanstveni rad
Corrosion of metal surfaces is inevitable, so it is needed to be prevented by a proper corrosion protection method. Powder coatings are effective way to prevent corrosion in metal parts. Critical areas on the structures are welded joints which can have negative effect on the coating durability due to different weld geometry and deformations. The aim of this work was to investigate the corrosion resistance of several electro-resistant weld types. Coating was performed at an electrostatic powder coating plant. All samples were treated under the same coating parameters, the difference is the chemical pre-treatment (phosphate and zirconium) and shape (appearance) of the welds. Namely, three weld types participated in the testing: 1. welds with minimal or no deformation, 2. welds with a slight degree of deformation, while the 3. weld type had significant and very significant deformations (needles, protrusion, foamy deformations). Research included salt spray test, microscopic analysis, and electrochemical impedance spectroscopy. Results of this work showed that phosphate conversion coating under epoxy- polyester coating is better for anticorrosion durability of spot-welded wire products that have significant weld deformations
praškasti premaz, korozija, organske prevlake, kemijska predobrada, slana komora, elektrootporni točkasti zavar
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