高圧装置の腐食モニター実施例

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  • Corrosion Monitoring of a High Pressure Equipment
  • コウアツ ソウチ ノ フショク モニター ジッシレイ

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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.<br>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 120-160°C and a pressure of 15-10kg/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.<br>Anodic polarizations showed that 316L stainless steel in the process liquid had two current peaks and that the first peak around -0.7V and the second peak around +0.3V represented a primary passivation current and a rapid transpassive dissolution current, respectively.<br>It was found that potentials kept between the two peak potentials could prevent 316L S. S. from corroding and that under normal operating conditions, 316L S. S. of the decomposer had potentials in its passive region, -0.1 to 0 volt.<br>Monitoring of the potentials of electrodes put in an autoclave set connected to the decomposer allow an early detection of the corrosion of the decomposer 316L S. S. taking place under unusual poerating conditions.

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