Galvanic corrosion behavior of electroless nickel coating in al-Zubare harbor-water

Abstract EN

Electrode potentials in AL-Zubare harbor water (South -Gas Company), of 23.88 ohm-cm at 20oC were reported for 26 metals and alloys including values for electro less nickels that signify a greater passivity than steel.

The large potential difference between steel and electro less nickel predicts severe galvanic corrosion, which was confirmed by weight loss data for coupled steel and electro less nickel electrodes immersed in AL-Zubare Harbor water (South -Gas Company, 23.88 ohm-cm at 20oC) .Changes in the phosphorous content in the range of 7.10 to 12.45 percent had only a slight effect on the electrode potential of electro less nickel.

This study indicates the beneficial use of electro less nickel coating is more passive than other (metals and alloys) and that galvanic corrosion of active metals such as steel can be severe.