Milica M. Vasić, Naděžda Pizúrová, Tomáš Žák, Dragica M. Minić
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引用次数: 0
摘要
微观结构是影响材料功能特性的重要因素,本研究对通过化学还原法制备和热处理的镍-铂和镍-铁-铂合金粉末进行了研究。此外,还介绍了所研究材料的微观结构和热诱导转变对其在中性、碱性和酸性介质中腐蚀行为的影响。为了详细研究上述现象,使用了不同的结构和电化学技术,包括 XRD、TEM、DTA、电位动力学和 EIS 测量。研究表明,合金粉末的成分和微观结构取决于反应物的比例和材料的热历史。在制备的粉末中存在的少量结晶相以及在结晶过程中形成的结晶相包括以下部分或全部相:Ni、Ni3P 和 Ni12P5。研究表明,在 Ni-P 粉末合金中加入少量铁会极大地影响材料的微观结构和热稳定性,有利于形成保护性氧化层,从而提高在氯化物环境中的耐腐蚀性。
Influence of Chemical and Phase Composition of Ni–P-Based Alloy Powders on the Corrosion Behavior in Various Environments
The as-prepared and thermally treated Ni–P and Ni–Fe–P alloy powders obtained by chemical reduction were studied regarding the microstructure, as an important factor affecting the functional properties of the materials. Also, the influence of the microstructure and thermally induced transformations of the studied materials on the corrosion behavior in neutral, alkaline, and acidic media is presented. For a detailed study of the mentioned phenomena, different structural and electrochemical techniques were used, including XRD, TEM, DTA, potentiodynamic, and EIS measurements. The composition and microstructure of the studied alloy powders were shown to be dependent on the reactant ratio and thermal history of the material. Small amounts of crystalline phases present in the as-prepared powders, as well as crystalline phases formed during crystallization, included some or all of the following phases: Ni, Ni3P, and Ni12P5. It was shown that the addition of small amount of Fe into the Ni–P powder alloy considerably affects the microstructure and thermal stability of the material, having beneficial effect on the formation of protective oxide layers and thus on the corrosion resistance in chloride environments.