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| Effects of nitrogen content on pitting corrosion resistance of non-magnetic drill collar steel |
| Li‑wei Xu1, Hua‑bing Li1, Huai‑bei Zheng2, Peng‑chong Lu1, Hao Feng1, Shu‑cai Zhang1, Wei‑chao Jiao1, Zhou‑hua Jiang1 |
| 1 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114002, Liaoning, China |
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Abstract High-nitrogen (N) austenitic stainless steel (Cr–Mn–N series) is commonly used for non-magnetic drill collars, which exhibits excellent mechanical properties and corrosion resistance. The effects of N content (0.63 to 0.86 wt.%) on the pitting corrosion behavior of the experimental non-magnetic drill collar steel were investigated using the electrochemical tests and immersion tests. Besides, X-ray photoelectron spectroscopy was used to analyze the constitution of the passive film. The results show that with the enhancement of N content from 0.63 to 0.86 wt.%, the metastable pitting corrosion sensitivity of the tested materials in 3.5 wt.% NaCl solution decreased and the pitting corrosion resistance increased. Meanwhile, the corrosion rate in 6 wt.% FeCl3 solution at 30 °C decreased from 10.40 to 4.93 mm/a. On the other hand, nitrogen was concentrated in the form of ammonia (NH4+ and NH3) on the outermost surface of the passive films. The contents of Cr2O3 and Fe2O3 raised in the passive films, together with the content of CrN, at metal/film interface increased as N content increased from 0.63 to 0.86 wt.%, which facilitated protective ability of the passive films, thus contributing to higher pitting corrosion resistance.
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| Cite this article: |
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Li‑wei Xu,Hua‑bing Li,Huai‑bei Zheng, et al. Effects of nitrogen content on pitting corrosion resistance of non-magnetic drill collar steel[J]. Journal of Iron and Steel Research International, 2020, 27(12): 1466-1475.
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2020, Vol. 27 
