Using real-time UV–visible spectrophotometer to assess an Al–Zn–Mg–Cu alloy's dissolution in acidic solution

• Main Authors: Qingqing Sun, Yang Yang, Shuai Wang, Panyi Liang, Bin Lin, Huabing Li
• Format: Article
• Language: English
• Published: The Royal Society 2020-11-01
• Series: Royal Society Open Science
• Subjects: real-time monitoring; dissolution; aa7150; uv–visible spectrophotometer
• Online Access: https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.200461
• ISSN: 2054-5703

Applicability and limitations of using online non-destructive ultraviolet–visible (UV–vis) spectrophotometer to monitor the dissolution of an Al–Zn–Mg–Cu alloy in HCl-containing solution were studied. Inductively coupled plasma atomic emission spectrometry results indicate that the spectrum absorbance at 252 nm is mainly attributed to Cu-containing complexes. Surprisingly, an hours-long ‘induction' period was observed from UV–vis results. This is not a real indicator of induction for Al dissolution as revealed by electrochemical impedance spectrum, actually it reflects the alloy's galvanic corrosion nature that Cu species are released after Al, Zn and Mg species.