Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : galvanic corrosion

The Influence of Area Ratio, Temperature and Rotational Speed on Galvanic corrosion between Law Alloy Steel–Copper couple in 4%NaCl Solution

S.A. Jafar

Engineering and Technology Journal, 2017, Volume 35, Issue 6, Pages 617-623

Galvanic corrosion between law alloy steel and copper couple in 4 % NaCl solution was studied and the effect of some variable were investigated. The effect of area ratio, temperature and rotational speed through the electrolyte have been investigated. An increase in galvanic current was observed when we increased the area ratio of law alloy steel to copper and the galvanic potential moved to extra negative direction. When the temperature of solution increase led to increase the galvanic current and shifting the galvanic potential to extra negative direction. The galvanic current rises clearly with increasing of rotational velocity of agitator with shifting the galvanic potential to extra positive due to mass transfer control the process. In addition, increase the diffusion of oxygen from bulk of electrolyte to the metals surface.

Galvanic Corrosion of Carbon Steel –Copper in Aerated H2SO4 Under Agitation Conditions

Muayad F. Hamad; Huda D.Abdul Kader; Basim O. Hasan

Engineering and Technology Journal, 2015, Volume 33, Issue 9, Pages 2107-2118

Galvanic and free corrosion experiments on carbon steel-copper couple in 3% H2SO4in the presence of NaCl salts were carried out under different operating conditions. The effect of temperature, agitation speed, and air bubbling (O2 concentration) on the free and galvanic corrosion was studied and discussed. The galvanic corrosion was investigated by both weight loss method and by determining the galvanic currents using zero resistance ammeter (ZRA). The results revealed that increasing temperature leads to increase the galvanic corrosion rate and also the free corrosion rate of each metal. Increasing agitation velocity enhanced the galvanic corrosion rate in a manner depending on temperature. The presence of air bubbling increased the corrosion rate and galvanic currents at low air pumping rate, while, at high pumping rate, air bubbling decreased the corrosion rate.