Abstract
AbstractThe rates of corrosion of tin specimens either intermittently or continuously immersed in several alkaline solutions have been compared. Similar solutions have been used to wash specimens of tinned steel that were exposed to the weather between washes in imitation of the service life of some tinned steel containers.The relative corrosive action of various solutions on intermittently immersed tin depends on the experimental conditions and may differ from that observed when the metal is immersed continuously. The results obtained with short periods of immersion are strongly influenced by the variation with the nature of the solution, the temperature and the condition of the metal surface, and of a period of delay between immersion of the metal and the onset of corrosion. A high rate of corrosion during the period between removal of the metal from the test solution and rinsing also introduces a potential cause of variation in the results of intermittent‐immersion tests.The deterioration in the protective quality of a tin coating on steel periodically washed in an alkaline solution can be predicted only moderately well from measurements of the corrosion rate of tin immersed in the solution. This deterioration results more from the enlargement of new pores formed in the coating during periods of exposure to the weather than from general dissolution of the tin, and silicates appear to restrain this action.In the conditions of the tests employed, with solutions of equivalent caustic alkalinity, sodium hydroxide, carbonate and phosphate had similar effects; sodium silicate (2 : 1) produced less deterioration; sodium metasilicate much less and sodium silicate (1 : 2), almost none. Additions of sodium sulphite to the washing solution had a negligible effect but additions of sodium chromate preserved both tin and steel. Additions of sodium hypochlorite either to washing or rinsing solutions accelerated deterioration of the coating except when made to solutions of sodium metasilicate or of sodium silicate (1 : 2).
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