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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Roles of Copper and Nickel in 13 percent Cr Stainless Steel for Improvement of Wet Carbon Dioxide Corrosion Resistance
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Roles of Copper and Nickel in 13 percent Cr Stainless Steel for Improvement of Wet Carbon Dioxide Corrosion Resistance

机译：Roles of Copper and Nickel in 13 percent Cr Stainless Steel for Improvement of Wet Carbon Dioxide Corrosion Resistance

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摘要

Resistance to hydrogen sulfide (H_2S) and carbon dioxide (CO_2) corrosion in 13 percent Cr stainless steel (SS) has been studied to develop a new material in an application field of oil country tubular goods (OCTG). Recently, the combined addition of copper and nickel was found to increase the corrosion resistance of 13 percent Cr SS under wet, high-temperature, and CO_2 environments. The purpose of the present work was to make clear the role of such copper and nickel elements as additive elements to the 13 percent Cr SS. With the increase in the addition of copper and nickel to the steel, a thickness of corrosion film growing in the immersion test decreased drastically, and the corrosion rate reached < 0.1 mm/y, even at 200 deg C. The transmission electron microscope analysis revealed that the thin corrosion film was an amorphous phase, and that the addition of copper caused the change of the corrosion film structure from a spinel crystalline to the amorphous one. Nano-ordered segregation of copper at the inter-face between the corrosion film and a steel was detected in the case of amorphous corrosion film: that is, the copper segregation was considered to be a dominant factor to form the amorphous corrosion film. Since the added nickel increased the solubility of copper in the steel, the role of nickel is discussed from the viewpoint of an assist effect of copper for the improvement of the corrosion resistance.

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