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Application of thermally sprayed coatings of the type WC/CoCr in reverse osmosis processes for seawater desalination
Author(s) -
Dwars A.,
Kochanowski W.,
Schramm B.,
Sehr F.
Publication year - 2008
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200804174
Subject(s) - tribology , materials science , reverse osmosis , coating , seawater , brine , resist , desalination , metallurgy , composite material , membrane , oceanography , geology , genetics , physics , layer (electronics) , biology , thermodynamics
Seawater desalination based on the reverse osmosis process requires a variety of hydraulic systems. The material concepts of these hydraulic systems are designed to reliably resist the corrosive properties of seawater and brine as well as the tribological loads. Strong tribological loads typically occur during the start‐up and shutdown of multi‐stage high‐pressure pumps. Thermally sprayed coatings can be used to increase the wear resistance and also the tribological properties of bearings. Also in pressure exchangers for energy recovery, high tribological loads occur on the surfaces of rotors which operate with a clearance gap of 40–100 µm. Today, thermally sprayed coatings are used for the surface protection of these rotors. To resist the various tribological loads, the material pairs are optimized for each case. Thermally sprayed coatings with high surface hardness have proven to be particularly successful. A coating system, based on a CoCr matrix, has been developed especially for these applications.