Quenching Mode Effect on Corrosion Resistance of Aluminum Alloy V91

Susceptibility of aluminum alloys to local corrosion (layer corrosion, pitting, corrosion cracking, and corrosion fatigue) limits their industrial use. Optimizing the heat-treatment modes can considerably reduce effects of these corrosion types. The effect of quenching mode on corrosion resistance of the heat-hardenable aluminum alloy V91 of the Al-Zn-Mg-Cu system, heat-treated according to the T3 mode, is investigated. Isothermal quenching of the samples in saline solutions was conducted consistently in two shaft furnaces. Polarization measurements were taken using a potentiodynamic method. The structural examinations were performed for obtaining data to forecast corrosion characteristics. The dependence of quenching modes on corrosion resistance of heat-hardenable aluminum alloy is found. Based on experimental data, kinetic charts are built which can be used to forecast a structure and properties of alloy products after heat treatment.

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