J Mater Sci Technol ›› 1989, Vol. 5 ›› Issue (3): 203-206.

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Effect of Temperature and Chloride Ion Concentration on the Electrochemical Behaviour of Stainless Steel

LI Donggui J.P.Simpson R.Schenk Dalian Acid Proof Pump Plant,China. Sulzer Bros.Ltd,Winterthur,Switzerland.   

  • Received:1989-05-28 Revised:1989-05-28 Online:1989-05-28 Published:2009-10-10

Abstract: The effect of temperature and chloride ion concentration on the electrochemical behaviour of austenitic-ferritic duplex stainless steel COR 25 in an aqueous solution of 60%H_3PO_4+4%H_2SO_4 is studied in this paper. The experiments show that the anodic active peak current on potentiodynamic polarization increases by an order of magnitude with an in- crease of temperature from 50℃ and with an increase of chloride ion from<1 mg/1 to 1500mg/1. Compared with the other materials tested, the austenitic-ferritic duplex stainless steel shows favourable corrosion characteristics in electrochemical tests,being comparable to the fully austenitic alloy Sanicro 28,which has a higher chromium and nickel content,and is much better than GX3CrNiMo2010.Corrosion of the duplex material is normally phase selec- tive,with phase boundary attack after unfavour- able heat treatments.

Key words: temperature, chloride, corrosion behaviour, duplex stainless steel