Studying the effect of copper and zinc ions on the corrosion rate of carbon steel

الملخص EN

An experimental work was performed to study the effect of Zn, Cu ions on the corrosion rate of carbon steel in distilled and tap water solution containing, 25 and 50 ppm concentration of Zn, Cu ions at pH range 4, 6 and 8 in distilled water and at pH8 in tap water at room temperature under both static for 10 weeks and 1, 2, 6 and 12 hours with dynamic conditions.

The obtained results showed that the corrosion rate was increased in the presence of 50 ppm of Cu ions in tap water (2.32mpy) after 10 weeks, under static conditions, whereas under dynamic conditions, it was reached (10.511 mpy), the presence of fine suspended solid particles in the solutions may also cause an increase in corrosion rate due to their movement over the carbon steel surface .In contrast, the presence Zn ions in solution as sacrificial anode, therefore, the corrosion rate was 2.24 times less than that in presence of Cu ions, at the same conditions.

In distilled water, the corrosion rates were decreasing slightly with adding Zinc and copper ions comparing to absence of metals ions in solution except at pH4 in the presence 50ppm of Cu ions may be accounted due to the increasing in the conductivity of the solution, under static conditions.

At 25ppm of Zn ions lowering in corrosion rate may be explained that the Zn ions were protected carbon steel surface by sacrificial.

In the absence of Zn, Cu ions were also carried out.