Corrosion performance of inorganic coatings in seawater
conference paper
Inorganic coatings are widely used to protect carbon steel hydraulic cylinder rods from wear and corrosion in aggressive offshore environment. Different types of lay-ers such as Ni/Cr, Al2O3, Cr2O3, TiO2, and Inconel 625 layers were applied to the carbon steels by plasma, High Velocity Oxygen Fuel (HVOF) and laser cladding methods. The anti-corrosion properties of the coated systems were investigated by exposure tests and EIS measurements in seawater at room temperature. The results show that the laser cladding layers have the best corrosion performance among the coated systems studied. The corrosion resistance for the galvanized Ni layer is bet-ter than the Ni layer plus a Cr layer on the top, since the porous Cr layer causes the Ni corrosion underneath. The corrosion resistance for the Ni plus Cr layers increases with the thickness of the Cr layer. The WC layers applied to the Metco 1005 interme-diate layer using HVOF method have also a better corrosion performance than the Al2O3-TiO2 and Cr2O3-TiO2 layers applied to the Ni/Cr layers using plasma method within the test period. The Ni/Cr layer applied by plasma and the Metco 1005 layer applied by HVOF without a top ceramic layer showed limited corrosion protection.
TNO Identifier
464090
ISBN
9781618394125
Source title
European Corrosion Congress 2011, EUROCORR 2011, 4-8 September, 2011, Stockholm, Sweden
Collation
16 p.
Files
To receive the publication files, please send an e-mail request to TNO Repository.