Wear resistance of alumina-coated oil casing steel N80 via MAO with rare earth additive. Issue 8 (1st June 2017)

• Record Type: Journal Article
• Authors: Huang, Min; Wang, Yu; Chu, Chang-hui; Zhang, Meng-xian; Wang, Hai-Bo; Xue, Shuang-xi
• Is Part Of: Ceramics international. Volume 43:Issue 8(2017)
• Page Start: 6397
• Page End: 6402
• Publication Date: 2017-06-01
• Subjects: Ceramic coating -- Low-temperature aluminizing -- Microarc oxidation (MAO) -- Wear resistance -- Oil casing steel N80; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.02.050
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The wear resistance of oil casing steel N80 was improved by packing its aluminide prelayer at a relative low temperature. Then, an alumina coating was obtained through microarc oxidation (MAO), in which different La2 O3 contents were added into the electrolyte. The chemical compositions and microstructures of the as-prepared coatings were characterized through scanning electron microscopy (SEM) equipped with energy-dispersive spectrometer (EDS). The wear resistance of the coated oil casing steel N80 under simulated oil and gas well condition was also investigated. With 1.5 g/L La2 O3 addition, a denser alumina coating containing α-Al2 O3 and γ-Al2 O3 with 1750 HV microhardness value was obtained. Under the simulated oil and gas well wear condition, the oil casing steel N80 with an alumina ceramic coating, which was prepared by adding 1.5 g/L La2 O3 in the electrolyte, showed a stable friction coefficient and low weight loss. Among the steel samples in this study, the oil casing steel N80 with an alumina ceramic coating exhibited the least wear debris and the shallowest groove. The influence mechanism of rare earth on the microstructure of the ceramic coating via MAO was discussed in detail.