Influence of rare-earth Nd and Y on the corrosion behavior of AZ91 magnesium alloy based on corrosion big data analytics
Source abstract
Abstract
In this study, AZ91D magnesium alloy was modified with Nd and Y, the effects of these rare-earth elements on its corrosion behavior and underlying mechanisms were systematically investigated via corrosion big data technology and hydrogen evolution tests. SEM, EBSD, and TEM analyses showed that addition of Nd and Y refined the grain structure, reduced the fraction of the Mg17Al12 second phase, and disrupted its continuous network distribution along grain boundaries. XRD and XPS analysis of corrosion products revealed that Nd and Y participated in the formation of corrosion product film, leading to generation of compounds such as Nd2O3 and Y2O3, which improved the compactness of the film. SKPFM results further demonstrated that the potential difference between second phase and the matrix played a key role in the galvanic corrosion behavior of the alloy. The Al-RE second phases formed after the addition of Nd and Y acted as weak cathodic phases and exhibited a smaller potential difference with the α-Mg matrix than Mg17Al12, thereby significantly reducing the driving force for micro-galvanic corrosion.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Corrosion Behavior and Inhibition · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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