Mircowave Absorption and Corrosion Resistance Properties of FeSiAl@Al2O3 Coating Materials

Mircowave absorption materials can solve the problem of electromagnetic pollution, but corrosion in harsh environments will lead to a decrease in its absorption performance, so it is important to study materials that are both mircowave absorption and corrosion-resistant. In this experiment, FeSiAl alloy was coated Al2O3 (noted as FeSiAl@ Al2O3 coating) with aluminum chloride hexahydrate as aluminum source, and its mircowave absorption and corrosion resistance properties were studied. The results show that the mircowave absorption and corrosion resistance performance of FeSiAl@ Al2O3 coating both are obviously improved. The minimum reflection loss of FeSiAl@Al2O3 is -43.4 dB, the matching thickness is 2.3 mm, and the effective bandwidth is 2.97 GHz. For the coated alloy, the corrosion current decreases from 3.538*10-4 A/cm2 to 3.499*10-4 A/cm2, and the corrosion resistance increases from 96.1 ohm to 225.1 ohm. This provides an effective way to develop iron aluminum silicon materials that combine microwave absorption and corrosion resistance.