LI Donggui J.P.Simpson R.Schenk Dalian Acid Proof Pump Plant
,
China. Sulzer Bros.Ltd
,
Winterthur
,
Switzerland.
材料科学技术（英文）
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.
关键词:
temperature
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LI Donggui J.P.Simpson R.Schenk Dalian Acid Proof Pump Plant
,
China. Sulzer Bros.Ltd
,
Winterthur
,
Switzerland.
材料科学技术（英文）
The effect of heat treatment on the corrosion performance of austenitic-ferritic duplex stain- less steel COR 25 in aqueous solution containing 60%H_3PO_4+4%H_2SO_4+1500 ppm Cl~- at 95℃ was in- vestigated.When the solution temperature was increased from 950℃ to 1230℃,the corrosion resistance increased by two orders of magnitude, as shown by electrochemical measurements,im- mersion tests and direct observation under the scanning electron microscope.The specimens heat treated at solution temperatures of 950℃ and 1030℃ were severely corroded along the phase boundaries;specimens treated at 113C℃ and 1230℃ tended to selective corrosion caused by the dissimilar chromium contents of the aus- tenite and ferrite phases after heat treatment.
关键词:
heat treatment
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