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《Materials for Mechanical Engineering》 2009-01
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Corrosion Behavior of X65 Steel in CO_2 Acidic Solution at Different Temperature

LIU Yong-dan1,2,LIU Hai-lang2,WANG Bao-jian2(1.Lanzhou University of Technology,Lanzhou 730050,China;2.Jiangxi University of Science and Technology,Ganzhou 341000,China)  
X65 steel specimens were tested in an acidic solution containing CO2 with a pressure of 1 MPa at 60-150 ℃ for 72 h in an autoclave.XRD,EPMA,SEM and weight-loss methods were used to analyze the corrosion products and corrosion rates.The results showed that the corrosion rates at 60 ℃,90 ℃,120 ℃ and 150 ℃ were 10.97,3.70,8.37 and 18.97 mm·a-1 respectively.Protective films of FeCO3 were not generated at 60 ℃ resulting in serious corrosion.Fine and compact protective films of FeCO3 were formed at 90 ℃ and reduced the corrosion rate markedly.The FeCO3 films were relatively fine but scattered at 120 ℃ and were coarse and loose at 150 ℃ and thus increased the corrosion rate.
【CateGory Index】: TG142.41
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