Corrosion around weld seams in foam storage tanks
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The two foam storage tanks are made of 304 stainless steel, and the medium used is a 3% water-based film-forming substance. Currently, there are corrosion-related perforations around the welds of these tanks. I would appreciate it if experts and professionals could help analyze this issue and suggest ways to prevent it in the future. Thank you
Empirical analysis shows that when welding jointed tank ring plates using cast iron materials for welding purposes, the stainless steel plates get contaminated in high-temperature environments! There are no conditions to conduct laboratory tests
Before using stainless steel storage tanks, it is essential to know the properties of the medium being used, especially the chloride ion content. The main cause of this corrosion is the corrosion of the weld seam by chloride ions in water. Mainly, the hardness of the weld bead differs from that of the metal lattice and the base material; furthermore, due to the fixing measures used, cast iron is present under high temperatures, and cast iron can contaminate the stainless steel. So first, electrochemical corrosion occurs in the weld bead. Polymer materials can be used to protect the weld seam from corrosion, which can solve the problem.
What is the high temperature? For normal chloride corrosion protection, polyaniline coatings are sufficient
Mao Sui volunteered himself; polyaniline coating :)