AZ91D和AM60B合金熔体在不同气氛下动态形成早期表面膜的表征：比较研究

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-06-10 DOI:10.22068/IJMSE.1570

A. Mirak

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引用次数: 0

摘要

在本研究中，研究了液态AZ91D和AM60B合金在超高纯（UHP）氩气、干燥空气和与两种不同的含氟保护气体混合的空气下的表面氧化和氟化的早期阶段。通过SEM和EDS分析，对截留气泡内形成的表面膜的化学成分、形貌和厚度进行了表征。研究发现，AM60B合金在超高压氩气作用下对杂质的敏感性高于AZ91D合金。在干燥空气气氛下，熔融的AZ91D合金的整个表面被氧化物层覆盖，并且厚度比AM60B合金上形成的表面膜薄，AM60B具有粗糙的表面，在氧化的后期表现出颗粒生长。EDS分析表明，薄膜化学成分主要由Mg、Al和O元素组成。在含有SF6或HFC-R134a的含氟气体/空气混合物（体积分数为3.5%）下，形成由Mg、F、Al和O元素组成的具有均匀厚度的平坦致密形态的新鲜表面膜。与AM60B合金相比，在空气/R134a和空气/SF6混合物下，在与干燥空气混合的1，1，2-四氟乙烷（HFC-R134a）下，在熔融AZ91D合金上形成的表面膜中存在较低的O∶F强度比，这表明表面膜a中的氟浓度较高，从而导致更好的抗氧化性。

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Characterization of the Early Surface Films Dynamically Formed on Molten AZ91D and AM60B Alloys Under Different Atmospheres: A Comparative Study

In the present study, the early stages of the surface oxidation and fluoridation of liquid AZ91D and AM60B alloys under ultra-high purity (UHP) argon, dry air, and air mixed with two different protective fluorine-bearing gases were studied. The chemical composition, morphology and thickness of the surface films formed inside the trapped bubbles were characterized by SEM equipped with EDS analysis. It is found that the molten AM60B alloy is more sensitive to impurities under UHP argon gas than AZ91D alloy. Under dry air atmosphere, the entire surface of molten AZ91D alloy is covered with an oxide layer and thinner thickness than the surface film formed on AM60B alloy which has rough surface exhibiting granular growth in later stages of oxidation. The EDS analysis shows that the film chemistry is mainly composed of Mg, Al and O elements. Under fluorine-bearing gas/air mixtures with either SF6 or HFC-R134a at 3.5%vol., a fresh surface film formed with a flat and dense morphology with a uniform thickness consisting of Mg, F, Al and O elements. It is observed that there is a lower O:F intensity ratio in the surface film formed on the molten AZ91D alloy under 1,1,1,2-tetra-fluoroethane (HFC-R134a) mixed with dry air compared to the AM60B alloy under both air/ R134a and air/SF6 mixtures which shows a higher fluorine concentration in the surface film a leading to a better oxidation resistance.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.