Gn. Haidemenopoulos et al., HYDROGEN ABSORPTION INTO ALUMINUM-ALLOY 2024-T3 DURING EXFOLIATION AND ALTERNATE IMMERSION TESTING, Corrosion, 54(1), 1998, pp. 73-78
Citations number
13
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Exfoliation and alternate immersion corrosion were investigated in Al
alloy 2024-T3 (UNS A92024) uptake during exposure and to correlate it
with corrosion characterization. Characterization involved determinati
on of weight loss, pitting density, and maximum depth of attack. Hydro
gen uptake was determined by subsequent hydrogen evolution during heat
ing. In both accelerated corrosion tests, pitting developed into inter
granular corrosion and intergranular attack. Hydrogen penetrated throu
gh Al 2024-T3. In the exfoliation test, hydrogen concentration correla
ted well with the increase in available surface area during intergranu
lar attack. There was indirect evidence that the first portions of hyd
rogen absorbed were arrested chemically inside the specimen. Free hydr
ogen (which evolves with mild heating) started to build up only after
all active sites were occupied.