Study on Corrosion Resistance of SERMETEL Coating
Main Article Content
Abstract
Using 17-4PH steel with good toughness and castability, easy to press and weld as the base material, SERMETEL water based high temperature resistant coating for coating, the 17-4PH stainless steel surface after surface cleaning is coated with a part of the shot peening method of first coating the bottom coating and then coating the sealing coating, the other part is coated with primer coating to dry after sand blasting treatment and then coated with sealing coating. The service performance of the coating was tested by continuous spray resistance to synthetic seawater, heat/synthetic seawater salt spray cycle test and electrochemical test, after 100h SERMETEL coating shot blasting and sandblasting treatment, obvious corrosion occurred on the surface of the sample, and the color of the sample surface became dark, and scattered pitting pits were visible. The pitting pits on the surface of the samples of synthetic seawater continuously sprayed for 1000h were enlarged and connected into sheets. Serious corrosion has occurred on the surface of the 1000h synthetic seawater continuous spray sample, after the combined alternating action of high temperature and seawater salt spray, the surface of the sample has a relatively obvious and large corrosion trace, especially the specimen edges corrosion is more serious, the coating corrosion exposed the substrate, and the substrate appeared obvious rust color. The self-corrosion potential and self-corrosion current density of SERMETEL coated 17-4PH stainless steel samples treated with shot blasting and sandblasting were determined by electrochemical experiments in different concentrations of NaCl solution. Found shot peening and sandblasting coating corrosion rate is the fastest in 5% NaCl solution.
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