Corrosion Analysis of Stainless Steel Reactor in Glyphosate Manufacturing Factory

The glyphosate-manufacturing reactor made of 304 stainless steel suffered serious corrosion after using for no less than 2 months. Metallographic analyses of the base metal and welding seam of the reactor wall and oxygenator upper plate indicate that the corrosion of the base metal of reactor wall and oxygenator upper plate was mostly closed or open pitting corrosion. The base metal had the tendency of inter granular corrosion, but it didn′t occur. Stress corrosion cracking occurred in oxygenator top plate. The anti-corrosion program of spraying 316L stainless steel plus sealing treatment was presented.