Metal materials resistant to concentrated hydrochloric acid corrosion for chemical industry
Based on the corrosion mechanism of metal materials in hydrochloric acid,corrosion resistances of titanium,zirconi-um,tantalum and their alloys,as well as Hastelloy alloys,to concentrated hydrochloric acid were summarized.The influences of temperature,concentration,and oxidizing components content of hydrochloric acid on corrosion rate and corrosion type were ana-lyzed,which provided reference for material selection in chemical unit and development of alloys resistant to concentrated hydro-chloric acid corrosion.Titanium and its alloys were not resistant to concentrated hydrochloric acid corrosion;the corrosion rate of Hastelloy B-3 in boiling concentrated hydrochloric acid was no more than 0.35 mm/a,while that of Hastelloy C series was greater than 2.5 mm/a;in a certain temperature range above the boiling point of concentrated hydrochloric acid,the corrosion rate of zir-conium was less than 0.13 mm/a.With the change of temperature and concentration of hydrochloric acid,the corrosion resist-ance of tantalum changed very little,which was better than that of zirconium.When there were oxidizing components such as Fe3+in hydrochloric acid,the corrosion rate of Hastelloy B-3 increased sharply,while the corrosion rates of Hastelloy C-2000 and C-22 decreased significantly.However,pitting corrosion and stress corrosion cracking occurred on zirconium.
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