CORROSION OF CARBON STEEL CAUSED BY SALT CONCENTRATION DIFFERENCE MACROCELL IN SOIL
土壤盐浓差宏电池对碳钢的腐蚀

The effect of salt concentration difference macrocell (2.0%Cl - and 0.02%Cl -) on the corrosion of A3 steel was studied in the simulated soil of moisture sands by means of weight loss and electrochemistry methods. It was shown that the sample in the higher salt concentration soil was anode of the macrocell at begining of test, then the polarity of the macrocell was altered after 5 days of experiment. The former anode of the macrocell in the higher salt concentration soil turned to be cathode. This form of macrocell continued until the end of the experiment.