Abstract
There is a large area of saline-alkali soil in Chinese coastland, especially in Tianjin and Cangzhou. The steel grounding bodies of the power plants, substations, transmission lines and distribution equipment in such area are corroded seriously by saline-alkali soil. For example, in some 220kV substations in Tianjin area, the steel grounding grids have been corroded by 60% after operating for only 7 years, with a rate of 1mm per year. The life of the grounding grids in such soil is usually not longer than 5 or 6 years. Thus, the expense for replacing them is very large.
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