Fig 1. Comparison of Sn-Al content by activator.
Fig 3. SEM images of 304 stainless steel nut before/after Sn-Al thermal diffusion coating and EDS analysis of coated specimen. (a) uncoated(surface) (b) coated (surface) (c) coated(cross-section) (d-f) EDS results of (a), (b), (c) respectively.
Fig 2. Formation mechanism of Sn-Al thermal diffusion coating layer using pack cementation method [3].
Fig 4. XRD patterns of Sn, Al powder and Sn-Al thermal diffusion coated 304 STS substrate.
Fig 5. Coating thickness of Sn-Al thermal diffusion coated specimens. (a) the graph of coating thickness with processing temperature and time (b) SEM image of T3 condition(Table 3)
Fig 6. Sectional view of the test configuration and the test apparatus for measuring galling resistance.
Fig 7. Result of galling test. (a) Galling frequency as a function of applied stress (b) galled test specimens.
Table 1. Chemical composition of 304 STS(substrate) (wt %)
Table 2. The ratios of Sn-Al thermal diffusion coating mixture powder (wt %)
Table 3. Test condition of Sn-Al thermal diffusion coating
References
- A.P. Harsha, P.K. Limaye, R. Tyagi, A. Gupta, Effect of Temperature on Galling Behavior of SS 316, 316 L and 416 Under Self-Mated Condition, Journal of Materials Engineering and Performance, 25 (2016) 4980-4987. https://doi.org/10.1007/s11665-016-2363-2
- A.P. Harsha, P.K. Limaye, Influence of temperature on galling resistance of SS 416, Proceedings of Malaysian International Tribology Conference, (2015) 98-99.
- M.C. Galetz, Coatings for Superalloys, M. Aliofkhazraei, INTECH, peer-reviewed ed, (2015) 295.
- X. J. Ning, J. H. Kim, H. J. Kim, C. Lee, Characteristics and heat treatment of cold-sprayed Al-Sn binary alloy coatings, Applied Surface Science, 255 (2009) 3933-3939. https://doi.org/10.1016/j.apsusc.2008.10.074
- M-X. Zhang, P. M. Kelly, Surface alloying of AZ91D alloy by diffusion coating, Journal of materials research, 17(10) (2002) 2477-2479. https://doi.org/10.1557/JMR.2002.0360
- N. P. Padture, M. Gell, E. H. Jordan, Thermal barrier coatings for gas-turbine engine applications, Science, 296 (2002) 280-284. https://doi.org/10.1126/science.1068609
- J. Y. Lee, J. H. Lee, J. Hwang, Y. K. Lee, Development of Zn-Al thermal diffusion coating technology for improving anti-corrosion of various metal products, Corrosion Science and Technology, 13 (2014) 195-203. https://doi.org/10.14773/cst.2014.13.5.195
- R. Bianco, R. A. Rapp, Pack cementation aluminide coatings on superalloys: codeposition of Cr and reactive elements, Journal of the Electrochemical Society, 140(4) (1993) 1181-1190. https://doi.org/10.1149/1.2056219
- 권순우, 윤재홍, 주윤곤, 조동율, 안진성, 박봉규, 9. Incoloy909 합금의 최적 알루미나이징 확산 코팅, 한국표면공학회지, 40(4) (2007) 175-179. https://doi.org/10.5695/JKISE.2007.40.4.175
- Z. D. Xiang, P. K. Datta, Kinetics of Low-Temperature Pack Aluminide Coating Formation on Alloy Steels, Metallurgical and Materials Transactions A, 37A (2006) 3359-3365.
- Standard, A.S.T.M, G196-08, Standard Test Method for Galling Resistance of Material Couples, PA:ASTM International, (2016).
- F. D. Geib, R. A. Rapp, Simultaneous chromizing-Aluminizing coating of low-alloy steels by a halide-activated, pack-cementation process, Oxidation of Metals, 40 (1993) 213-228. https://doi.org/10.1007/BF00664491