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An attempt was made to use the damage parameter, β obtained from non-linear ultrasonic assessment, to quantify pitting damage in 7075 aluminium alloy. β values were found to be different for the two tempers, T6 and T73. β reflected the pitting damage quite well in the initial stages of pitting, during which the non-linearity change in the lattice was mostly governed by the creation of free surfaces...
Hydrogen permeation through API 5L X65 pipeline steel was studied under freely corroding conditions in NACE solution (simulated seawater) and poisoned 1N H 2 SO 4 . A steady state condition with regards to permeation flux is not obtained due to the presence of corrosion product, changing sample dimension and a possible change in hydrogen availability on the corroding surface. A unique...
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