caa a22 4500 475815203 CHVBK 20180406123808.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1023/A:1004011916609 doi (NATIONALLICENCE)springer-10.1023/A:1004011916609 Studies on the influence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy [Elektronische Daten] [R. Ambat, N.N. Aung, W. Zhou] The influence of chloride ion concentration and pH on the corrosion and electrochemical behaviour of die-cast and ingot-cast AZ91D alloy have been studied with a focus on the stability of microconstituents in these environments. The experimental techniques used include immersion studies, potentiodynamic polarization, X-ray diffraction and optical and scanning electron microscopy. The corrosion rate for the ingot and die-cast was very high in highly acidic solutions (pH 1-2) as compared to that in neutral and highly alkaline solutions (pH 4.5-12.0), and the rate increased with chloride ion concentration at all pH levels. In general, the die-cast showed a lower corrosion rate at all pH values and chloride ion concentrations. The open circuit corrosion potential shifted to more negative (more active) values with increase in concentration of chloride ions. Corrosion morphologies revealed more attack on primary α and eutectic α with increasing chloride concentration. In highly acidic conditions, corrosion attack was found on β (Mg17Al12) and eutectic α phase (α regions with higher Al content) while at pH 12.0 the ingot exhibited a pitting type of morphology. The corrosion product consisted of magnesium hydroxide, fallen β particles and magnesium-aluminium oxide; the amount of each component was found to be a function of chloride ion concentration and pH. Kluwer Academic Publishers, 2000 AZ91D alloy nationallicence chloride ion nationallicence corrosion nationallicence die-cast nationallicence ingot nationallicence magnesium alloys nationallicence pH nationallicence Ambat R. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore aut Aung N.N. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore aut Zhou W. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/7(2000-07-01), 865-874 0021-891X 30:7<865 2000 30 10800 https://doi.org/10.1023/A:1004011916609 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1004011916609 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ambat R. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore aut NATIONALLICENCE 700 1- Aung N.N. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore aut NATIONALLICENCE 700 1- Zhou W. School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/7(2000-07-01), 865-874 0021-891X 30:7<865 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer