J. Phys. IV France
Volume 112, October 2003
Page(s) 1137 - 1140

J. Phys. IV France
112 (2003) 1137
DOI: 10.1051/jp4:20031083

Superelastic NiTi coatings with good corrosive wear resistance

J. Koskinen1, E. Haimi2, A. Mahiout1, V.K. Lindroos1 and S.-P. Hannula1

1  VTT Industrial Systems, P.O. Box 1703, 02044 VTT, Finland
2  Helsinki University of Technology, Laboratory of Physical Metallurgy and Materials Science, P. O. Box 6200, 02015 Hut, Finland

In the present study corrosive wear resistance of NiTi coatings produced by hot isostatic pressing (HIPping) were tested using a slurry pot type of equipment. The samples were rotated in a slurry that contained 100g/l of quartz sand in liquid. Two types of liquids were used. In the corrosive test the liquid was INH 2SO 4-water solution and in the neutral reference tests the liquid was deionized water. The radial velocity was 4.7 m/s, temperature $25 \pm 5$ °C, and duration 5 hours. Furthermore, additional corrosion tests were performed with the same apparatus and the sour liquid but without the quartz sand. The results were compared with AISI 316 steel, bulk NiTi, and some other materials. The results showed that HIPped NiTi coatings have a very good corrosive wear resistance.

© EDP Sciences 2003