Haruo Shimada

Rust Prevention Control by Changing Sulfide Type

Abstract The first stage of rust formation process is the dissolution of α(Mn,Fe)S into dew water at the steel surface. Therefore, rust prevention can be expected by changing the sulfides in steel from the water soluble type, α(Mn,Fe)S, to the water insoluble type. This paper deals with the rust prevention control process. The dissolution tendency of various sulfides into water has been examined by using the electrolytically extracted sulfides from steel, and then the difference of rust resistance of steel sheets due to the change of sulfides type has been studied with acceleration tests in the humid atmosphere. The obtained results revealed that the most appropriate rust prevention can be achieved by fixing all the sulfur in steel as the water insoluble sulfides, (Ce,Mn)(O,S).

The Extraction and Observations of Large Inclusions in Steel

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