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STUDY ON CORROSION AND EROSION-CORROSIONBEHAVIORS OF CARBON STEEL IN NAPHTHENICACID MEDIUMS AT HIGH TEMPERATURE |
Xinqiang Wu;Hemin Jing;Yugui Zheng |
中科院金属所 |
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Abstract The corrosion and erosion-corrosion behaviors of A3 carbon steel in naphthenic acid mediums at high temperature were studied in det ail.The erosion-corrosion resistance of A3 carbon steel in industrial oil-refini ng environment was also investigated.The results revealed that the total acid nu mber (TAN),the temperature and the velocity of flow play important roles in affe cting the naphthenic acid corrosion (NAC)and erosion-corrosion (NAEC)behaviors o f carbon steel,which influence the degree of NAC and NAEC by influencing the tra nsportation of naphthenic acid molecules toward the metal surface,the absorption of naphthenic acid molecules on the metal surface,the active reaction on the me tal surface,and the spallation of corrosion products from the metal surface.In g iven corrosion mediums,the control step of NAC process is mainly dependent on th e temperature.The carbon steel has little resistance to the NAC and NAEC,so this material should be used cautiously in industry oil-refining installation,especi ally in the places where the temperature,the TAN and the velocity of flow are ra ther high.
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Received: 29 June 2001
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Corresponding Authors:
Xinqiang Wu
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