The effect of chloride concentration and pH on pitting corrosion of AA7075 aluminum alloy coated with phenyltrimethoxysilane

摘要: The effect of chloride ion concentration and pH solution on the corrosion behavior aluminum alloy AA7075 coated with phenyltrimethoxysilane (PTMS) immersed in aqueous solutions NaCl is reported. Potentiodynamic polarization, linear open circuit potential, weight loss measurements were performed. surface samples was examined using SEM optical microscopy. Elemental characterization coating by secondary mass spectrometry indicates an intermediate layer between surface. depends solution. In acidic or neutral solutions, general pitting occur simultaneously. On contrary, exposure to alkaline results only. Results further reveal that susceptible all concentrations 0.05 M 2 NaCl; increase slightly shifted both potentials more active values. Linear polarization resistance show a substantially improved value case PTMS as compared uncoated (pH = 7), 0.85 3), 10 12.85). higher can be attributed hydrophobic which acts barrier prevents penetration subsequent reaction alloy.