GRAPHITIZATION OF CAST IRON AS AN ELECTROBIOCHEMICAL PROCESS IN ANAEROBIC SOILS,

摘要

Topics include: Review of the literature; description of the phenomenon of corrosion of cast iron in the ground; sulfate reduction and its occurrance in nature;consideration of the possibility that hydrogen sulfide from sulfate reduction is the cause of iron graphitization; significance of sulfate reduction in the process of iron corrosion in the ground; chemistry of the anaerobic iron-corrosion process with sulfate reduction; process of iron corrosion with sulfate reduction in the laboratory is the same as anaerobic iron corrosion in the ground; iron corrosion processes encountered in waterline practice,considered from the electrochemical point of view,do not differ essentially from each other; concept of 'aggressiveness'of soils;discussion of pipe material and its protection in connection with soil aggressiveness.