Corrosion Monitoring of a High Pressure Equipment

Abstract

An electrochemical monitoring of corrosion of a high pressure stainless steel decomposes in a urea plant, one of corrosion hazards often taking place in various synthesis processes of urea, was made with a newly developed electrochemical test apparatus. The process liquid in the decomposer was composed of NH3, H2O, CO2, urea, ammonium carbamate and some other minor elements. The decomposer was operated at a temperature of 120-160C and a pressure of 15-100kg/cm2. Test of corrosion of the stainless steels for the decomposer were conducted for both the process liquid in the high pressure decomposer and simulated solutions prepared from pure chemicals. Anodic polarizations showed that 316L stainless steel in the process liquid had two current

Effects of Anion on the Corrosion Behaviors of Carbon Steel Under Artificial Rain Fall Test

“…5. It can be explained by the fact that the CR can approach maximum when the electrolytesurface film covering the metal become very thin, below 56 µm [1,9,[15][16][17]. For the larger thickness of the film, especially under the rainfall with homogenous concentration, the CRs will stabilize at a constant value.…”