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Influence of alloying elements on the corrosion of fine art bronze in the strong corrosive environment

The influence of Sn, Zn, and Pb on the corrosion of fine art bronze in strong corrosive environment were investigated. The value of loss mass and the potential of the specimens were determined in the artificial sea-water environment. Corrosion of specimens was compared each to other to find the effect of the elements. The corrosion products were determined with the XRD/SEM/EDS analyses. The results shown that, Sn decreases the corrosion rate of the bronze alloy in marine environment while Zn increases it. | Vietnam Journal of Chemistry, International Edition, 55(6): 787-790, 2017 DOI: 10.15625/2525-2321.2017-00545 Influence of alloying elements on the corrosion of fine art bronze in the strong corrosive environment Bui Binh Ha, Nguyen Hong Hai, Pham Mai Khanh*, Ta Dinh Tinh School of Materials Science and Engineering, Hanoi University of Science and Technology Received 4 July 2017; Accepted for publication 29 December 2017 Abstract The influence of Sn, Zn, and Pb on the corrosion of fine art bronze in strong corrosive environment were investigated. The value of loss mass and the potential of the specimens were determined in the artificial sea-water environment. Corrosion of specimens was compared each to other to find the effect of the elements. The corrosion products were determined with the XRD/SEM/EDS analyses. The results shown that, Sn decreases the corrosion rate of the bronze alloy in marine environment while Zn increases it. The corrosion rates and potential curves showed that the corrosion rate of the bronzes reduced with immersion time. Alloy containing 0.7% Pb; 1.6% Zn; 9.7 % Sn; 88% Cu (in %wt.) has the corrosion rate as lowest. Keywords. Corrosion, strong corrosive environments, fine art bronze, Sn, Pb, Zn. 1. INTRODUCTION Copper and copper alloys are found and used very early by humans. Copper have the special properties of the metal such as: good electrical conductivity, good thermal conductivity, iridescence, high plasticity and high strength. Moreover, it has a special property: good corrosion resistance that is why copper and copper alloys were applied in many different fields, especially in the case of working environments in which the details need a good corrosion resistance to increase their life and to reduce the corrosion rate. Copper alloy C83600 (ASTM standard with 85 % Cu, 5 % Sn, 5 % Zn, 5 % Pb in wt.) is widely used in the world, especially in the European countries where casting statues can be placed outside [1-3]. However, .