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Formation of Super-Corrosion Resistant Bulk Amorphous Alloy Coatings by Thermal Spraying and Properties of Coatings Having Nano-Structure after Crystallization

热喷涂超耐蚀大块非晶合金涂层的形成及结晶后纳米结构涂层的性能

基本信息

批准号：
15560627
负责人：
OTSUBO Fumitaka
金额：
$ 1.92万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560627/
关键词：
amorphous Thermal spray coating HVOF nano-structure corrosion resistance プラズマ溶射

项目摘要

Alloy powders of Fe-10Cr-10Mo-2C-8P (alloy A), Fe-16Cr-30Mo-4C-2B (alloy B) and Fe-16Cr-30Mo-2C-1B-7P (alloy C) were made for thermal spraying. The coatings of these alloys were prepared on the mild steel substrate by atmospheric plasma spraying(APS) and high velocity flame spraying(HVOF) processes. Perfect amorphous coatings were obtained by the HVOF process from all alloys. Whereas, the perfect amorphous coatings were obtained by the APS process from only alloy B and C. The current density of the coating of alloy Awas close to that of the coatings of alloys B and C from the anodic polarization curves of the HVOF coatings in 1N HCl solution. Therefore, it was thought that the corrosion resistance of the coatings of all alloys was almost the same. The corrosion resistance of the APS coating of alloy A was the same as SUS316L plate from the immersion test in HCl solution. On the other hand, the corrosion resistance of the coatings of alloys B and C was excellent, because the corrosion rate of the APS coatings of alloys B and C was 1/100 of that of the alloy A. The tempered coatings of alloys A,B,and C were composed of ferrite, M_<23>C_6,M_7C_3 carbides and M_3P phosphide, ferrite, M_<23>(C,B)_6, M_7(C,B)_3 borocarbides and ferrite, M_<23>(C,B)_6,M_7(C,B)_3 borocabides and M_3P phosphide, respectively. It was recognized that the fine-grained structure of 10nm in diameter was formed in the coating of alloy B after crystallization from TEM observation. Also, the HVOF coating of alloy C held the nano-structure after tempered at 973K for 100h. The corrosion resistance of the tempered coatings was inferior to that of the as-sprayed coatings in resistant to hydrochloric acid solution. However, it was showed that the tempered coatings were superior to nickel-based self-fluxing alloy coating in resistant to hydrochloric acid solution.

制备Fe-10 Cr-10 Mo-2 C-8 P（合金A）、Fe-16 Cr-30 Mo-4 C-2 B（合金B）和Fe-16 Cr-30 Mo-2 C-1 B-7 P（合金C）的合金粉末用于热喷涂。采用大气等离子喷涂（APS）和高速火焰喷涂（HVOF）工艺在低碳钢基体上制备了这些合金的涂层。采用超音速火焰喷涂技术，在所有合金表面均获得了理想的非晶涂层。而APS工艺仅由合金B和C获得了理想的非晶涂层。从HVOF涂层在1 N HCl溶液中的阳极极化曲线来看，A合金涂层的电流密度与B和C合金涂层的电流密度相近。因此，认为所有合金的涂层的耐腐蚀性几乎相同。合金A的APS涂层在盐酸溶液中的腐蚀性能与SUS 316L板材相同。另一方面，合金B和C的涂层的耐腐蚀性优异，因为合金B和C的APS涂层的腐蚀速率是合金A的1/100。合金A、B和C的回火层分别由铁素体、M_<23>（<23>C，B）_6、M_7（C，B）_3硼碳化物和铁素体、M_（C，B）_6、M_7（C，B）_3硼<23>碳化物和M_3 P磷化物组成。TEM观察发现，合金B涂层晶化后形成了直径约为10 nm的细晶组织。合金C的HVOF涂层在973 K回火100 h后仍保持纳米结构。回火涂层的耐盐酸腐蚀性能不如喷涂涂层。结果表明，回火涂层的耐盐酸腐蚀性能上级镍基自熔性合金涂层。