Abstract
The purpose of this study is to investigate the influence of Zn contents on tensile characteristics of Al-Mg-Zn series alloy under corrosive environment. The three types of alloy in which weight fraction of Zn addition was 0 (none add), 3.0 and 4.0 wt% were prepared. Solution and aging (T6) treated was conducted to prepared materials. The heat treated material was machined to tensile specimen with circumferential V-notch. Tensile strength under corrosive environment was characterized by constant load tensile test with 1 wt% of NaCl solution of corrosive media. Behavior of hydrogen generation of those materials was also evaluated by fixed point observation. Test results were as follows: the amount of hydrogen generation was increased with increase of weight fraction of Zn. The critical strength at corrosive environment was decrease with increase of weight fraction of Zn. The value of critical strength under corrosive environment of AC7A with 3.0 wt% of Zn was almost equal as 0.2 proof stress of AC4CH. Finally this study concludes that AC7A with 3.0 wt% of Zn could be used to material for casted aluminum wheel with the same design criteria as the conventional material.
