Effect of Sn content on corrosion resistance of iron

The study characterizes the acid corrosion resistance of six iron alloys containing additions from 0.007 to 1.03 wt. % of tin. The alloys were obtained by way of remelting in a Tamman furnace made of pure iron (99.98% Fe) with additions of spectrally pure tin. The obtained melts underwent studies of acid corrosion resistance by means of an atmospheric corrosion test, electrochemical tests and corrosion rate measurements (determination from the analysis of the corrosion solutions in respect of the Fe²⁺ content). The performed electrochemical measurements show that both in the environment of sulfuric acid and acidified sodium sulfate, the presence of 0.007-1.03% Sn in the iron does not exhibit a significant effect on the corrosion rate of the examined alloys. The obtained values of i_cor (determined by way of extrapolation to E_cor and based on R_p), within their measurement error, can be treated as independent of the tin content in the alloy. However, one can observe the effect of the presence of tin on the course of atmospheric corrosion in the acid salt spray - this rate is reduced with an increase of the Sn content in the analyzed samples.

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