Effect of test parameters on intergranular corrosion test results of 5083-H116 aluminum alloy

The effects of temperature, nitric acid mass fraction and test time on the intergranular corrosion test results of 5083-H116 aluminum alloy were studied. The results show that 5083-H116 aluminum alloy had excellent intergranular corrosion resistance. The corrosion rate under standard test conditions was only 1.34 mg/cm², and there was no intergranular corrosion characteristics on the surface of the sample. When the mass fraction of nitric acid was constant, the corrosion rate of the aluminum alloy increased exponentially with the increase of the test temperature. When the test temperature was constant, with the increase of nitric acid mass fraction, the corrosion rate of the aluminum alloy showed a downward trend. Under the standard test conditions, with the extension of test time, the corrosion rate of the sample showed a slow upward trend and tended to be stable. After changing the test conditions, the principle of nitric acid immersion intergranular corrosion test of 5083 aluminum alloy was deviated, and the results failed to effectively characterize its intergranular corrosion performance. Finally, ASTM G67-24a standard was recommended for intergranular corrosion test of 5083 aluminum alloy.