Corrosion Characteristics and Corrosion Prediction Model of Aluminum Alloys in Saturated NaCl Solution

Abstract

For investigating the corrosion behavior of aluminum alloy materials in saturated NaCl solution environment and selecting suitable materials for this harsh environment, based on the actual working conditions of industrial waste salt refining and recycling equipment, five common types of aluminum alloy materials of 2024, 3003, 5052, 6061 and 7075 were selected to carry out short-term and long-term corrosion experiments in saturated NaCl solution at 70 ℃, 80 ℃, 90 ℃, 100 ℃ and 110 ℃, respectively. The corrosion morphology and corrosion products were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS) and other methods. Results indicated that 6061 possessed excellent corrosion resistance in both short-term and long-term corrosion, the corrosion products of aluminum alloy materials were mainly Al2O3 and Al(OH)3, and the corrosion types included local pitting and denudation. Moreover, the simulation predictions revealed that GM(1,1) model could reflect the change law of the aluminum alloy corrosion process well, and the corrosion degree at different times could be calculated to achieve the effect of risk prediction.

Keywords

• salt water corrosion; aluminum alloy material; corrosion; temperature; gm(1,1) model