Pitting corrosion of amorphous Ni-Zr alloys in chloride ion containing sulfuric acid solutions
Pitting corrosion of amorphous Ni-Zr alloys in chloride ion containing sulfuric acid solutions
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非晶镍锆合金在含氯离子硫酸溶液中的点蚀
DOI：
10.2320/matertrans1989.38.443
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
K. Hashimoto
中科院分区：
文献类型：
--
作者：
A. Kawashima;W.;B.;H. Habazaki;K. Asami;K. Hashimoto
用电化学方法研究了含30- 75at%锆的快淬非晶态Ni-Zr合金、电弧熔炼晶态Ni-Zr合金和含20- 84at%锆的电沉积Ni-Zr合金在303 K、含和不含0.1kmol/m3 NaCl的脱气0.5kmol/m3 H2SO 4中的点蚀行为。在不含Cl -的硫酸溶液中，这些合金均自发钝化，其动电位行为相似。在含Cl -的溶液中，所有的快淬非晶合金在阳极极化过程中都发生点蚀，点蚀电位随锆含量的增加而降低。另一方面，结晶性电弧熔化的低锆合金遭受点蚀，但对于含有70原子%或更多锆的结晶性合金没有观察到点蚀。此外，点蚀电位随锆含量的增加而增加。无论非晶和晶体结构如何，所有的电镀沉积合金都没有遭受点蚀。因此，快淬非晶合金最易发生点蚀。在熔纺薄带的光亮侧（顶侧）和无光侧（轮侧）表面之间观察到点蚀行为的显著差异。凹坑是从无光泽的侧面开始形成的。因此，无光泽的侧表面可能是熔纺带的这种不寻常的点蚀行为的原因。
The pitting corrosion behavior of the melt-spun amorphous Ni-Zr alloys with 30-75 at% zirconium, the crystalline arc-melted counterparts and the sputter-deposited Ni-Zr alloys with 20-84 at% zirconium was examined by electrochemical measurements in deaerated 0.5 kmol/ m 3 H 2 SO 4 with and without 0.1 kmol/m 3 NaCl at 303 K. In the sulfuric acid solution without Cl - , these alloys were spontaneously passive and their potentiodynamic behavior was similar to each other. In the Cl - -containing solution, all the melt-spun amorphous alloys suffered pitting during anodic polarization and the pitting potential decreased with an increase in zirconium content. On the other hand, the crystalline arc-melted low zirconium alloys suffered pitting but no pitting observed for the crystalline alloys containing 70 at% zirconium or more. In addition, the pitting potential increased with the zirconium content of crystalline alloys. All the sputter-deposited alloys did not suffer pitting regardless of the amorphous and crystalline structures. Therefore, the melt-spun amorphous alloys were the most susceptible to pitting corrosion. A marked difference was observed in the pitting behavior between the shiny side (top side) and the dull side (wheel side) surfaces of the melt-spun ribbon. The pits initiated from the dull side surface. Thus, the dull side surface could be responsible for such an unusual pitting behavior of the melt spun ribbon.