Preparation of Corrosion-Resistant Bulk Amorphous Alloys

耐腐蚀大块非晶合金的制备

基本信息

批准号：
11650731
负责人：
HABAZAKI Hiroki
金额：
$ 2.37万
依托单位：
HOKKAIDO UNIVERSITY (2000)Tohoku University (1999)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650731/
关键词：
Amorphous alloys Bulk materials Corrosion resistance Copper mold casting Gas atomization Sheath rolling Super-cooled liquid Spontaneous passivation バルク合金ナノ結晶不働態 TEM

项目摘要

Corrosion-resistant bulk Ni-Cr-Nb-P-B, Ni-Cr-Ta-P-B and Ni-Cr-Me-P-B alloys with cylindrical shape of 1 and 2 mm diameter are prepared by a copper mold casting method. A good correlation between the glass forming ability and stability of super-cooled liquid state has been found for these alloy systems except the molybdenum-containing alloy system. The bulk amorphous alloys thus prepared are spontaneously passive even in very aggressive 6M and 12M HCl solutions open to air at 303 K.The bulk amorphous alloys reveal the same anodic and cathodic polarization curves as the corresponding melt-spun alloy ribbons, as far as amorphous single phase alloys are obtained. Precipitation of fcc Ni phase in the bulk amorphous alloys is detrimental to the corrosion resistance of the alloys. The influence of the precipitation is, however, strongly dependent upon the size of the precipitates. When fcc Ni with size of 20〜nm is formed in the amorphous matrix, the alloys show about two orders of magnitude higher passive current density in comparison with the amorphous single phase alloys. In contrast, precipitation of fcc Ni with only 2-3 nm size results in the increase only twice in the passive current density. Bulk amorphous Ni-10Cr-5Nb-16P-4B alloy plates of 2 mm thickness are also prepared by consolidation of gas-atomized amorphous alloy powders by sheath rolling at a super-cooled liquid state, that is, 708 K.The bulk alloy thus prepared is found to reveal similar extremely low corrosion rate in 6M HCl at 303 K to the corresponding melt-spun alloy. However, in 12M HCl solution, the sheath-rolled alloy shows preferential corrosion attack at boundaries of the gas-atomized powders, possibly due to the influence of the oxidation of the particle surface during heating for consolidation. Thus, further improvement of the preparation processes to obtain highly corrosion-resistant bulk amorphous alloys using this method.

耐腐蚀的大体ni-cr-nb-b d铸造方法。即使在非常激进的6m和12m K中，整体的无定形揭示了相同的阳极偏振曲线，而corespongongongongoss-spun-Spun-Spun-Spun-Spun-Spun-Spun-Sy-pun-Spun-siper ribones s单相可以获得大量非定态的FCC Ni相。合金的抗性。电流密度。在303 K的6M HCL中，相对于旋转合金的6M HCl在12M HCl溶液中。为了在汇总过程中氧化的影响。