Application of stainless steel in alkali solution medium
Austenitic stainless steel on weak base, such as hydroxide and organic compounds such as ammonia, which the organism and aliphatic amine aniline with excellent corrosion resistance, 304 stainless steel can be used in the ammonia distillation apparatus and some types of amination reaction.
By sodium hydroxide solution corrosion test, the stainless steel in the performance of alkali solution, 302 and 304 stainless steel in concentration below 50% NaOH solution, under the temperature 104 ℃, generally only mild corrosion. At higher temperatures and concentrations, erosion tends to be severe.
Under various stress effects, the corrosion cracking of the stress can occur in the solution of the hot hydroxide solution or the potassium nitrogen oxide solution. When a hot metal surface is eroded by a dilute solution, it can also be corroded by the vaporization of hydroxide.
Source: China Steel Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)