When X70 steel formed a macrocell between inoculation SRB or bactericide clay and sand, X70 steel in clay was an anode, while that in sand was a cathode.

• 结果表明，接菌或灭菌粘土和砂土组成的宏电池，砂土中试样为宏电池的阴极，粘土中试样为阳极；