Journal
RARE METALS
Volume 40, Issue 8, Pages 2266-2274Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01540-z
Keywords
Pack cementation; Coating; Modification; Activation energy; Corrosion
Funding
- Natural Science Foundation of Shandong Province of China [ZR2017LEM004]
- Open Fund of Key Laboratory of Oil & Gas Equipment, Ministry of Education (Southwest Petroleum University) [OGE201702-07]
- Fundamental Research Funds for the Central Universities [16CX06020A, 18CX02091A]
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The effects of Y modification on the microstructure and corrosion resistance of Zn-Fe coatings on 42CrMo steel were investigated. The results showed that Y modification improved the overall microstructure and corrosion resistance of the coatings.
Zn-Fe and Y-modified Zn-Fe coatings were prepared on 42CrMo steel through pack cementation processes at 370, 390 and 410 degrees 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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