Zinc Coatings for High-Strength Low Alloy Steels: Comparison of Microstructure and Hydrogen Embrittlement During Heat Treatment
| Autor: | Ihsann Ali, Faras Q. Mohammed, Ameen D. Thamer |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | International Journal of Nanoscience. 20 |
| ISSN: | 1793-5350 0219-581X |
| DOI: | 10.1142/s0219581x21500538 |
| Popis: | In this paper, the effect of hydrogen embrittlement in High-strength low-alloy steel (HSLA) material was studied. HSLA steels are known for their susceptibility to hydrogen induced failure especially when subjected to hydrogen rich environment. In this research, samples from HSLAS were surface-treated using chemical vapor deposition (CVD) techniques, followed by direct Zinc coating using physical vapor deposition (PVD). Other samples were additionally post-heat treated at a temperature of 260∘C for 4[Formula: see text]h to optimize the coating process. The hydrogen embrittlement test was performed by immersing the tensile samples in a solution containing H2SO4diluted with water for 24[Formula: see text]h. Hardness, and mechanical properties were evaluated using tensile testing. XRD and SEM were used for microstructural and topographical features’ examination of the treated samples. The results indicate that the samples of combined [Formula: see text] coating that was backed at 260∘C show superior resistance to hydrogen embrittlement compared to other conditions. This could be attributed to the buildup of a strong outer layer that prevents hydrogen from diffusing towards the base HSLAS material. The greater mechanical properties are possibly due to the reduction of hydrogen amount generated by the surface reaction associated by the formation of Zn(N[Formula: see text] phase and the reduction of hydrogen amount passed through Zn and C3N4layers. |
| Databáze: | OpenAIRE |
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