Corrosion behaviour of plasma-claddings from titanium alloys

摘要

This paper is dealing with investigation results of plasma weld surfacing with the titanium alloys Tigrade 2 and 12 and the correlation between structure and corrosion properties of such claddings oninterlayers of copper. First the developing of a process technique was important which allows an exact heat controlduring welding on copper and which ensures lowest dilution degrees between the materials. It was possible to produce two layered titanium claddings on a copper interlayer with a dilutionpercentage of smaller than 4% by using plasma-arc-powder surfacing with pulsed direct current. Optimized titanium claddings show structures without any defect and have a good adherence tothe base material whereas high degrees of dilution effect the formation of intermetallic phases andinhomogeneities of the structure. The results of various corrosion examinations have shown that protective layers produced byplasma-arc-powder surfacing are comparable with rolled reference material.