EIS Method to Study the Corrosion Resistance of Three Arc Spraying Composite Coatings in 3.5% NaCl Solution

Abstract:

To determine the sealing system of arc-spraying aluminum coating for steel structures in high humidity and harsh environments, electrochemical impedance spectroscopy (EIS) was used to study the corrosion resistance and matrix protection of three arc-sprayed aluminum /organic composite coatings in 3.5% NaCl solution. The results indicated that during the 660-day soaking experiment, the coating capacitance of the epoxy-sealing paint system was consistently lower than that of the phosphating primer system and the nano-sealing primer system. The coating resistance showed a decreasing-increasing-decreasing trend but remained above the level of 105 Ω· cm², and it was higher than the other two systems. The coating reaction resistance remained above 107 Ω· cm² throughout the entire experimental period, and in the later stage of the experiment, it was 2-3 orders of magnitude higher than the other two systems. It showed that the epoxy sealer system has better shielding performance and corrosion resistance. The protective process of arc-spraying composite coating on the substrate can be divided into four stages: water penetration of organic sealing coating, contact of aluminum coating with medium, formation of shielding layer by corrosion products of aluminum coating, and penetration of corrosion products of aluminum coating to seal pores of organic sealing coating.

• Periodical: Solid State Phenomena (Volume 366)
• Pages: 63-73
• DOI: https://doi.org/10.4028/p-0EpEWO
• Online since: December 2024
• Authors: Sha Sha Li, Hua Yu Zhao*, Yu Feng Lu, Kun Wang, Cai Bin Lu
• Keywords: Arc Spraying Aluminum, Corrosion Resistance, EIS, Protection Mechanism

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