Abstract
Zn–Fe and Y-modified Zn–Fe coatings were prepared on 42CrMo steel through pack cementation processes at 370, 390 and 410 °C for 4 h. Y modification was achieved through the co-deposition of Zn and Y2O3. The effects of Y modification on microstructure, formation and corrosion behavior of the Zn–Fe coating were investigated. The coating thickness increased with an increase in temperature. The Y-modified Zn–Fe coating was thicker than the plain Zn–Fe coating. Both the Zn–Fe coating and Y-modified Zn–Fe coating showed single-layered structures, but the overall microstructure was improved by Y modification. The activation energies for Zn–Fe coating and Y-modified Zn–Fe coating were 113.15 and 80.65 kJ·mol−1, respectively. The Zn–Fe coating consisted of FeZn13 and Fe11Zn40 phases. The effects of Y modification on the corrosion behavior of the Zn–Fe coating were evaluated through an immersion test and polarization measurements. The results showed that the corrosion resistance was improved by Y modification.
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Acknowledgements
This work was financially supported by the Natural Science Foundation of Shandong Province of China (No. ZR2017LEM004), the Open Fund of Key Laboratory of Oil & Gas Equipment, Ministry of Education (Southwest Petroleum University) (No. OGE201702-07) and the Fundamental Research Funds for the Central Universities (Nos. 16CX06020A and 18CX02091A).
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Liu, L., Yu, SR. & Cao, WA. Zn–Fe and Y-modified Zn–Fe coatings on 42CrMo steel via pack cementation. Rare Met. 40, 2266–2274 (2021). https://doi.org/10.1007/s12598-020-01540-z
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DOI: https://doi.org/10.1007/s12598-020-01540-z