Compared to zinc anodes, magnesium anodes in high resistivity soil will:

In high resistivity soil, magnesium anodes are known to deliver a higher current compared to zinc anodes. This is primarily due to the electrochemical potential associated with magnesium being more negative than that of zinc.

The more negative potential allows magnesium to corrode more readily in the presence of high resistivity soil conditions, leading to a more effective cathodic protection. As a result, magnesium anodes can generate a greater amount of current to protect the structure they are intended to safeguard, which is particularly beneficial in environments with high resistivity, such as dry or sandy soils where the electrical conductivity is low.

Additionally, while zinc anodes are effective in many scenarios, they may not perform as efficiently in these specific conditions, leading to a comparative lower current output in high resistivity environments.