期刊
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
卷 27, 期 12, 页码 1466-1475出版社
SPRINGER
DOI: 10.1007/s42243-020-00428-7
关键词
Non-magnetic drill collar; Nitrogen; Stainless steel; Pitting corrosion; Passive film
资金
- National Natural Science Foundation of China [U1960203, 51774074, 51434004]
- Shanxi Municipal Major Science and Technology Project [20181101014]
- Fundamental Research Funds for the Central Universities [N172512033, N2024005-4]
- Talent Project of Revitalizing Liaoning [XLYC1902046]
- State Key Laboratory of Metal Material for Marine Equipment and Application [HG-SKL (2019) 13]
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 degrees 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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