| Title |
Research on Exposure to Salt Water Environment of Fe-based Amorphous Alloy Coating Fabricated by Twin Wire Arc Spray |
| Authors |
권한솔(Hansol Kwon); 강용진(Yongjin Kang); 유연우(Yeonwoo Yoo); 김도현(Dohyeon Kim); 박영진(Youngjin Park); 남욱희(Uk Hee Nam); 변응선(Eungsun Byon) |
| DOI |
https://doi.org/10.3365/KJMM.2024.62.8.613 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Twin wire arc spray; TWAS; Fe-based amorphous alloy; Bond coating; Soluble salt immersion test; SSIT; Mechanical property |
| Abstract |
Fe-based amorphous alloys are promising structural materials that have a disordered lattice structure and metastable state. Due to their advanced properties, including high hardness, high elastic limit, improved wear and corrosion resistance, Fe-based amorphous alloys have a great potential for protective materials in harsh industrial fields. Twin wire arc spray (TWAS), which is a kind of thermal spray process, is a reasonable choice for depositing Fe-based amorphous coating. Industrial advantages of TWAS include simple apparatus, low cost, excellent field usability. Several previous studies of TWAS Fe-based amorphous coating have reported microstructural features, the effect of major element variation, and the effect of postheat treatment. Unfortunately, studies about Fe-based amorphous coating exposed to soluble salt solution are limited. Thus, a Fe-based amorphous coating was fabricated using TWAS in this study, and the effect of 3.5 wt.% NaCl solution exposure on its microstructure and mechanical properties was researched. Single- and multi-layer coatings were fabricated and Al-3%Ti was selected as a bond coat material. The results showed that single- and multi-layer Fe-amorphous coatings were successfully deposited on high strength low alloyed (HSLA) steel, which is a representative structural material for offshore construction. The single-layer coating showed continuous corrosion and the multi-layer coating showed delamination induced by Al-3%Ti bond coat galvanic corrosion. The Vickers hardness of the coating was retained after the long-term salt solution immersion test, thus, the feasibility of single-layer Fe-amorphous coating was confirmed. |