Corrosion inhibition of the 316L stainless steel in sodium hypochlorite media by sodium silicate

The present work relates to the use of silicates as corrosion inhibitor1of the stainless steel 316l bleaching process by the hypochlorite of sodium. the aggressiveness of alkaline solutions toward metals is essentially due to the instability of passive films which very often protect the metal of the surrounding environment. silicates act as an inhibitor of the localized corrosion of 316l stainless steel in bleaching process. they form a film which remains stable even in high potential,by moving the pitting potential towards more noble values. the alkalinity nature of silicates was determining in their choice as inhibitor,their addition does not modify the ph. the inhibition by silicates depends on their concentrations,immersion time,hydrodynamics conditions and surface corrosion state.