Enhancing Corrosion Resistance of AA۲۰۲۴-T۳ Alloy Using a Zn-Al LDH Based Conversion Coating with ZAPP corrosion inhibition Additive

Conversion coatings have historically been a widely used option for coating metals, particularly aluminum alloys, due to the availability of coating equipment and precursor materials from earth elements or their complexes. Chromate coatings have been commonly employed to enhance corrosion resistance in aluminum structures; however, their use is restricted due to the toxicity of hexavalent chromium. Layered double hydroxide (LDH) conversion coatings, combined with the corrosion-inhibiting pigment ZAPP, exhibit favorable properties such as ion exchange capability and a plate-like structure, providing protective coverage against highly corrosive environments like a ۳.۵% wt NaCl solution. This study will assess the microstructural properties of these coatings and their corrosion resistance through electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM).

کلیدواژه ها:

Aluminum alloy AA۲۰۲۴ conversion coating ، Chromate conversion coating ، corrosion