The study on the influence of surface cleanness and water soluble salt on corrosion protection of epoxy resin coated carbon stee
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The corrosion resistance of epoxy-coated carbon steel was evaluated. The carbon steel surface was subjectedto different treatment methods such as steel grit blasting and power tool treatment as well as contaminationof water soluble salt. To study the effect of the surface treatments and contamination, the topology ofthe treated surface was observed by confocal microscopy and a pull-off adhesion test was conducted. Thecorrosion resistance of the epoxy-coated carbon steel was further examined by electrochemical impedancespectroscopy (EIS) combined with immersion test of 3.5 wt% of NaCl solution. Consequently, the surfacecontamination by sodium chloride with 16 mg/m2, 48 mg/m2 and 96 mg/m2 didn’t affect the adhesion strengthfor current epoxy coated carbon steel and blister and rust were not observed on the surface of epoxy coatingcontaminated by various concentration of sodium chloride after 20 weeks of immersion in 3.5 wt% NaClaqueous solutions. In addition, the results of EIS test showed that the epoxy-coated carbon steel treatedwith steel grit blasting and power tool showed similar corrosion protection performance and surface cleannesssuch as Sa 3 and Sa 2.5 didn’t affect the corrosion protectiveness of epoxy coated carbon steel.
Abstract
The corrosion resistance of epoxy-coated carbon steel was evaluated. The carbon steel surface was subjectedto different treatment methods such as steel grit blasting and power tool treatment as well as contaminationof water soluble salt. To study the effect of the surface treatments and contamination, the topology ofthe treated surface was observed by confocal microscopy and a pull-off adhesion test was conducted. Thecorrosion resistance of the epoxy-coated carbon steel was further examined by electrochemical impedancespectroscopy (EIS) combined with immersion test of 3.5 wt% of NaCl solution. Consequently, the surfacecontamination by sodium chloride with 16 mg/m2, 48 mg/m2 and 96 mg/m2 didn’t affect the adhesion strengthfor current epoxy coated carbon steel and blister and rust were not observed on the surface of epoxy coatingcontaminated by various concentration of sodium chloride after 20 weeks of immersion in 3.5 wt% NaClaqueous solutions. In addition, the results of EIS test showed that the epoxy-coated carbon steel treatedwith steel grit blasting and power tool showed similar corrosion protection performance and surface cleannesssuch as Sa 3 and Sa 2.5 didn’t affect the corrosion protectiveness of epoxy coated carbon steel.
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