EFFECT OF Fe(III) LEVELS ON THE CORROSION RESISTANCEOF TITANIUM ALLOYS IN HCI SOLUTIONS

摘要

Corrosion tests were run concurrently at Location A and Location B to determine the effects ofrnferric ion [Fe(III)] content on inhibiting general corrosion of titanium Grades 2 (UNS R50400), 7 (UNSrnR52400), 12 (UNS R53400), 16 (UNS R52402), 27 (UNS R52254), and 28 (UNS R56323) inrnhydrochloric acid (HC1) solutions at 66-282℃. Tests were conducted at Location A with 1,000 andrn10,000 ppm Fe(III) additions to boiling HCI solutions to establish 5 mpy isocorrosion diagrams as anrnextension of previous work (1). Location A tests also assessed the effects of higher temperatures (282℃)rnon the corrosion performance of titanium Grades 2 and 7 in HCI solutions with 10,000 ppm Fe(III)rnadditions. Location B tests were performed to evaluate the corrosion resistance in 66℃, 82℃, andrnboiling HC1 solutions at concentrations up to 35 wt.% and Fe(III) additions up to 28,000 ppm. Therncomprehensive alloy corrosion database developed is applicable to many chemical process streams suchrnas hydrometallurgical acid ore leaching (2), acid cleaning of deep wells and other chemical processesrninvolving Fe(III) and other multivalent metal ions.