SYMPOSIA PAPER Published: 01 January 1988
STP26199S

The Effect of Soil Resistivity and Soil Temperature on the Corrosion of Galvanically Coupled Metals in Soil

Source

Galvanic corrosion current measurements carried out on stressed Type 301 stainless steel coupled to zinc at six underground test sites over a period of four years indicate that the galvanic current is controlled by soil resistivity or oxygen availability in the soil. In well aerated soils, resistivity plays a dominant role, but in poorly aerated soils, oxygen controls the corrosion process. Furthermore, at a certain depth, approximately 1 m, soil resistivity is strongly influenced by soil temperature and only slightly affected by soil moisture. Finally, Type 301 stainless steel in a half-hard or full-hard condition is susceptible to hydrogen embrittlement failure in soil when exposed to potentials capable of causing hydrogen evolution.

Author Information

Escalante, E
Corrosion Group, National Bureau of Standards, Gaithersburg, MD
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Details
Developed by Committee: G01
Pages: 193–202
DOI: 10.1520/STP26199S
ISBN-EB: 978-0-8031-5049-2
ISBN-13: 978-0-8031-0981-0