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Zirconium is one of the few metals that resists attack by sulfuric acid (H2SO4) up to 75% concentration. It is being frequently used to handle the acid in the difficult concentration range of 40 to 60%. However, due to environmental concerns, the dumping and the storage of H2SO4 wastes have become a problem. Contaminated H2SO4 is involved in many processes. The purpose of this investigation is a more precise characterization on the effects of impurities on the corrosion resistance of zirconium.
Corrosion behavior of zirconium alloys in H2SO4 with common detrimental impurities, that is, Fe+3, Cu+2, Cl−,
The performance of passivated Zr 702 and Zr 705 under a simulated upset condition, for example boiling 74% H2SO4, has been studied. It has been found that Zr 702 can withstand the upset conditions without significant attack up to 20 min, but Zr 705 will corrode immediately and rapidly.
zirconium, zirconium alloys, sulfuric acid, contaminated sulfuric acid, corrosion, upset condition, industrial applications
Corrosion group head, Metallurgical Research and Development, Teledyne Wah Chang Albany, Albany, Ore.