Electrochemical and XPS Studies on Corrosion Behavior of Amorphous Ni-Cr-P-B alloys
Electrochemical and XPS Studies on Corrosion Behavior of Amorphous Ni-Cr-P-B alloys
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非晶Ni-Cr-P-B合金腐蚀行为的电化学和XPS研究
DOI：
10.3323/jcorr1974.26.8_445
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
T. Masumoto
中科院分区：
文献类型：
--
作者：
K. Hashimoto;M. Kasaya;M. Kasaya;K. Asami;T. Masumoto
采用熔体快淬法制备了具有高耐蚀性和易形成非晶组织的Ni-Cr-P-B非晶合金。含铬7和9原子的合金。%在10%FeCl_3·6 H_2 O中300 ℃不腐蚀。这些合金在2 N H2SO 4和1 N HCl中发生自发钝化，即使在1 N HCl中，在阳极极化曲线上也没有观察到点蚀的临界电位。用X射线光电子能谱法同时测定了钝化膜的厚度和成分以及钝化膜下基体合金表面的成分。在2NH_2SO_4中形成的钝化膜主要由水合羟基氧化铬组成，与含铬耐蚀晶态合金上形成的钝化膜相似，在膜正下方的基体合金表面的成分与块体合金的成分没有区别。相反，在1 N HCl中形成的钝化膜的组成可以表示为（NiII0.26CrIII0.74）（PO 4）0.74Ox（OH）0.52-2x（1.74+x）H2O，因此磷酸盐占钝化膜的81%。此外，直接在膜下的基体合金的表面的组成从块体合金的变化。结果表明，含7 ~ 9at. Cr的Ni-Cr-P-B非晶态合金具有良好的抗氧化性能。%在强酸性溶液中具有高的耐腐蚀性，并且具有很强的耐点蚀性，但是由于直接在膜下的合金组成的变化，可能不总是长时间稳定。
Amorphous Ni-Cr-P-B alloys, which possess a high corrosion resistance and are apt to form the amorphous structure, have been prepared by rapid quenching from melts. The alloys containing chromium of 7 and 9 at. % are not corroded in 10% FeC13 6H2O at 300C. Spontaneous passivation occurs on these alloys in 2 N H2SO4 and 1 N HCI, and a critical potential for pitting is not observed on the anodic polarization curves even in 1 N HCl. Simultaneous determination of the thickness and composition of a passive film and the composition of the surface of substrate alloy directly under the passive film has been carried out by X-ray photoelectron spectroscopy. The passive film formed in 2N H2SO4 consists mainly of hydrated chromium oxy-hydroxide similar to those formed on corrosion-resistant crystalline alloys containing chromium and the composition of the surface of substrate alloy directly under the film is not different from that of bulk alloy. On the contrary, the composition of passive film formed in 1N HCl can be expressed as (NiII0.26CrIII0.74) (PO4)0.74Ox(OH)0.52-2x(1.74+x)H2O and hence phosphate comprises 81% of constituents of the passive film. In addition, the composition of the surface of substrate alloy directly under the film changes from that of bulk alloy. In conclusion, the amorphous Ni-Cr-P-B alloys with chromium of 7 to 9 at. % have a high corrosion resistance in strongly acidic solutions and the great resistance to pitting corrosion, but may not be always stable for a long time because of the change in alloy composition directly under the film.