Of course, oil corrodes. It's so complex, it's hard to detect all the specific components.

The composite sacrificial anode is composed of magnesium coated with zinc. The high driving potential of magnesium anode is used to meet the demand of large initial cathodic polarization current of the pipe, and the high current efficiency of zinc anode is used to extend the service life. The operation parameters of the composite sacrific anode buried in the ground are tested. The results show that the protection potential of the pipeline is up to -1.4 V, and the open anode potential is over -1.5 V. It is a very ideal magnesium anode potential, and its application effect is better than that of the magnesium-zinc mixed method.