A study on corrosion products and processes of patinated tin bronze in formic acid
- PDF / 1,547,438 Bytes
- 13 Pages / 439.37 x 666.142 pts Page_size
- 66 Downloads / 172 Views
A study on corrosion products and processes of patinated tin bronze in formic acid Ying Yan1 · Cong Zou1 · Lehua Zhang1,3 · Yan Zhu1 · Laiming Wu2 · Hao Zhou2 · Lankun Cai1 Received: 1 July 2020 / Accepted: 13 August 2020 / Published online: 24 September 2020 © Springer Nature B.V. 2020
Abstract The corrosion processes of bare bronze and three types of patina-bearing tin bronze in the presence of formic acid have been explored through laboratory exposure. Following exposure time of 4, 14 and 28 days, the morphology and composition of the corrosion products on the sample were characterized to investigate their evolution by using SEM, XRD and Raman. The results indicated that C u2O was first generated on the bare bronze surface, then Cu(OH)2 was formed at the early stage of the corrosion and as the exposure time increased, Cu(OH)(HCOO) and Cu(HCOO)2 were further generated. Bronze with Cu2O layer was destroyed by formic acid and converted into Cu(HCOO)2, which was similar to the conversion process of corrosion products of bare bronze, except that, the account of products of bronze patinated with Cu2O was more than that of bare bronze, indicating that the Cu2O layer on the sample surface was destroyed and further transformed. The main corrosion product of bronze with CuCl patina was C u2(OH)3Cl, which was consistent with the reaction process of powdery rust. For bronze with mixed patina, two corrosion processes of Cu2O patina and CuCl patina proceed at the same time, and the corrosion products were Cu(HCOO)2 and Cu2(OH)3Cl, which were basically consistent with the corrosion behavior of bronze covered with a Cu2O and a CuCl patina. Keywords Tin bronze · SEM · XRD · Raman · Formic acid corrosion
* Hao Zhou [email protected] * Lankun Cai [email protected] 1
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, College of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
2
Shanghai Museum, Shanghai 200050, People’s Republic of China
3
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200237, People’s Republic of China
13
Vol.:(0123456789)
5088
Y. Yan et al.
Introduction Atmospheric corrosion is prone to lead to the metal deterioration in various environments, which is the overall result of several physicochemical reactions between metals and their surrounding environment. Atmospheric corrosion behavior of metals and alloys has been mainly investigated in the presence of gases such as carbon dioxide, sulfur dioxide, sulfuric acid, hydrochloric acid and organic acids. [1–4]. It was in recent years that organic acid corrosion has received extensive attention due to its great threat to the safety of metals [5–9]. It has been shown that organic acids, especially formic and acetic acids, play an important role in the atmospheric corrosion of metal [10–12]. Organic acids are one of the most important chemical classes used in several indu
Data Loading...
