Brief Analysis of Anticorrosion Working Mechanism of Arc Spraying Aluminum Coating in Thermal Spraying

       Arc spraying in thermal spraying has long-term anti-corrosion performance, reducing maintenance costs of steel structures during service, reducing environmental pollution caused by coating construction, and extending the service life of steel structures. Metal spraying is inevitable for long-term corrosion resistance of steel structures. trend. Research and develop new thermal spray anti-corrosion materials and related coating sealing systems, in-depth research on the corrosion resistance mechanism of coatings under corresponding corrosion systems, improve relevant technical standards, and promote large-scale application of this technology, which will generate huge economic and social benefits.



Today, the processing manufacturer of wococarbide.com will introduce the anti-corrosion working mechanism of arc spraying aluminum coating in thermal spraying, let's learn about it together!



1. The isolation effect of blocking corrosive medium

Enamel and paint anti-corrosion are the mechanism

2. Cathodic protection through self-sacrifice of coating materials



The electrode potential of aluminum and its alloy coatings is lower than that of steel materials. In the presence of electrolyte, these coatings are anodic materials, and steel is cathodic materials, and a corrosion galvanic cell is formed between them. During corrosion, the anode material (coating) protects the cathode material (steel) through its own sacrifice.



Since the corrosion products of the aluminum coating can effectively slow down the corrosion rate, the consumption of the coating is also very slow, which can protect the steel substrate for a long time.



3. Anti-hydrogen sulfide corrosion mechanism of aluminum coating



The aluminum-based coating has excellent resistance to hydrogen sulfide corrosion. Al in the coating can form intermetallic compounds and Al2O3, and the internal stress of the generated corrosion products is relatively small, so that the coating can accommodate the plastic deformation it produces without causing Cracking or peeling of the coating.



The Al2S3 in the corrosion product can inhibit the outward diffusion of iron atoms, and the aluminum atoms can preferentially combine with sulfur, which hinders the formation of iron sulfides and ensures that the substrate is not corroded by hydrogen sulfide.