Characterization and Corrosion Behaviour of Zn-Sn Binary Alloy Coatings in 0.5 M H₂SO₄Solution

Abstract

This work examines the characterization and corrosion behaviour of laser alloyed UNSG10150 steel with three different premixed composition Zn-Sn binary powders using a 4.4 kW continuous wave (CW) Rofin Sinar Nd:YAG laser processing system. The steel alloyed samples were cut to corrosion coupons, immersed in sulphuric acid (0.5 M H 2 SO 4 ) solution at 30 o C using electrochemical technique and investigated for its corrosion behaviour. The morphologies and microstructures of the developed coated and uncoated samples were characterized by Optic Nikon Optical microscope (OPM) and scanning electron microscope (SEM/EDS). Moreover, X-ray diffractometer (XRD) was used to identify the phases present. An enhancement of 2.7-times the hardness of the steel substrate was achieved in sample A 1 which may be attributed to the fine microstructure, dislocations and the high degree of saturation of solid solution brought by the high scanning speed. At scanning speed of 0.8 m/min, sample A 1 exhibited the highest polarization resistance R p (1081678 Ω cm ) is 67,813-times the polarization of the UNSG10150 substrate and 99.9972% reduction in the corrosion rate.

Surface characterisation of electroplated tinplate with different coating mass

“…Generally, corrosion is an issue referred to the interaction between material substrate and corrosive electrolyte in certain environment. In practice, measures employed are usually as follows: [1] (i) improving the application environment, such as injection of inhibitors; (ii) improving the corrosion or erosion–corrosion resistance of the material substrate, such as material upgrading, surface modification (coatings or lining). Among all the employed measures, surface modification method is regarded as one of the most common and effective ways in counteracting corrosion [2-4].…”

Electrochemical performance and microstructural evolution of laser deposited Al‐Sn coating in acidic environment

“…HCl solution contains chloride ions which cause degradation on the surface of an iron at anodic active potential. This leads to incessant dissolution of the base metal causing corrosion degradation [26][27][28][29].…”