Galvanic Corrosion and Electrical Insulation between High Strength Steel and Typical Piping Materials B10 and TA2

Galvanic corrosion test was used to study the corrosion tendency and the extent of corrosion of high strength steel contacted with copper-nickel alloy (B10) or commercially pure titanium (TA2) at the area ratio of one to one.By gradually increasing the resistance between two galvanic materials,the influence rule of insulation resistance on galvanic corrosion was studied.The results show that the high-strength steel had an obvious galvanic corrosion tendency no matter it was contacted with B10 or TA2 in seawater,and the corrosion of high strength steel as an anode was aggravated after coupling.In the condition of test,galvanic corrosion rate of high strength steel decreased with the galvanic insulation resistance increasing,when the galvanic insulation resistance value between the two basic materials was higher than 10 kΩ,the extent of galvanic corrosion was controled effectively.