On the impact of Cr and Ag additions on the grain boundary microchemistry, hydrogen permeability and environmentally assisted cracking mechanism of an Al-Zn-Mg-Cu-Zr 7xxx alloy
Chijioke Kenneth Akuata , Oliver Beyß , Lisa.T. Belkacemi , Kerstin Hantzsche , Matthew E. Curd , Daniela Zander
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Abstract
This study explored the impact of minor Cr and Ag additions on the resistance of a new generation Al-8Zn-2Mg-2Cu-0.1Zr alloy to hydrogen environmentally assisted cracking (HEAC) in humid air. The results show that HEAC in Al-8Zn-2Mg-2Cu-0.1Zr alloy can be suppressed by 0.1 wt% Cr addition, due to the formation of E-Al18Mg3Cr2 dispersoids with a high H binding energy and possibly a less electrochemically active grain boundary (GB) microchemistry. ∼ 0.3 wt% Ag addition in Al-8Zn-2Mg-2Cu-0.1Zr alloy had no influence on the HEAC susceptibility, despite 1 at% Ag partitioning in the GB η-Mg(Zn,Cu,Al)2 and a minor decrease in the PFZ width.
期刊介绍：
Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies.
This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.
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