EDS analysis of corrosion products formed on the surface of carbon steel after immersion in: (a) pure 3.75M NH4Cl, (b) 3.75M NH4Cl+0.01M S2O32− solution, (c) 3.75M NH4Cl+0.1M S2O32− solution, and (d) 3.75M NH4Cl+1M S2O32− solution, for a period of 72h.
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