Improving the erosion–corrosion resistance of AISI 316 austenitic stainless steel by low-temperature plasma surface alloying with N and C
✍ Scribed by H. Dong; P.-Y. Qi; X.Y. Li; R.J. Llewellyn
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 712 KB
- Volume
- 431
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
The erosion-corrosion behaviour of low-temperature plasma surface alloyed AISI 316 austenitic stainless steel has been compared with untreated material using a newly developed slurry pot erosion-corrosion apparatus containing a slurry comprising 20 wt.% silica sand and 3.5%NaCl at 40 • C. The total erosion-corrosion wastage, the mechanical erosion under cathodic protection and the electrochemical corrosion were measured directly. Based on the data obtained the synergistic effect of erosion and corrosion was calculated. Post-test examination was conducted to identify material degradation mechanisms involved.
It has been shown that the erosion-corrosion resistance of AISI 316 austenitic stainless steel can be effectively improved by low-temperature plasma alloying with carbon (carburising) and nitrogen (nitriding) by 50% and 70%, respectively. The degradation process of the untreated steel is dominated by erosion whilst that of the low-temperature plasma carburised material is by an erosion-corrosion mechanism and that of low-temperature plasma nitrided AISI 316 mainly by corrosion-erosion.
The synergy between erosion and corrosion can be ranked from low to high in the order: untreated (1.7%), plasma carburised (30.0%) and plasma nitrided (69.4%) material.