Product Code: ICA12_P126

Corrosion Resistant Laser Coatings for Hydraulic Piston Rods
Authors:
Jari Tuominen, Department of Materials Science, Tampere Univ. of Technology; Tampere Finland
Jonne Näkki, Department of Materials Science, Tampere Univ. of Technology, Technology Centre Ketek Ltd.; Tampere Finland
Juha Junkala, Technology Centre Ketek Ltd.; Kokkola Finland
Juha Miettinen, Department of Mechanics and Design, Tampere Univ. of Technology; Tampere Finland
Tuomo Peltola, Technology Centre Ketek Ltd.; Kokkola Finland
Petri Vuoristo, Department of Materials Science, Tampere Univ. of Technology; Tampere Finland
Presented at ICALEO 2012

Hydraulic piston rods on oil & gas drilling platforms, chemical plants and underground mines are exposed to severe tribo-corrosive conditions under static and dynamic mechanical loads. Piston rods made of carbon, quenched & tempered and stainless steels are frequently surface coated with methods such as thermal spraying, hard-chrome plating and overlay welding. Unfortunately, several failures have been reported due to insufficient coating quality. Laser cladding has recently drawn lot of attention in this field thanks to improvements in productivity and high coating quality. In this study, several potential Fe-, Ni- and Co-based alloys for marine applications were laser clad on carbon and quenched & tempered steels. Their corrosion and mechanical performances were studied in long-term salt spray, hardness and 4-point bending fatigue tests. Most of the laser coatings outperformed hard-chrome in corrosion properties but hardness values were somewhat lower. Fatigue performance was strongly dependent on coating material.