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EFFECT OF WELDING PARAMETERS ON ZINC ELECTODEPOSITED WELDED LOW CARBON STEEL IN CHLORIDE ENVIRONMENT


THE ABSTRACT

This research work investigated the effect of welding parameters on zinc electodeposited welded low carbon steel in chloride environment. The low carbon steel substrates were subjected to welding under different welding voltage of 70, 90, and 100 Volts while keeping current and voltage at 13 Amperes 240 volt respectively using two different electrode gauge of 3.0 mm and 2.5 mm. 

The welded and as-received substrates were polished to 600 micron grit grade and were examined under optical metallurgical microscope to obtain the microstructures. The substrates were zinc electroplated at 1 volt for 15 minutes in zinc bath. Thereafter, the substrates were completely immersed in 0.5 M NaCl solutions for a period of 30 days. 

Electropotential and weight loss measurement are used as a means of assessing the corrosion performance. The result shows that the substrate welded at 70V with 3.0 mm electrode gauge, zinc electroplated at 1 volt for 15 minutes has the minimum corrosion rate of value of 0.0036 mg/mm2/yr and electropotential value of -240mV (SCE). The as-received unplated substrate has the highest susceptibility to corrosion. It is recommended that low carbon steel meant to be welded and used in the chloride environment should be zinc plated for a better corrosion performance.  

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