New ways to the manufacturing of pigmented multi-layer protective coatings

The manufacturing of pigmented multi-layer protective coatings is the matter of the present investigation. Finely sieved Al-Mg (4.5 wt.%) powders were used in combination with a phenyl-methyl silicone resin to form single or multi-layered coatings with good erosion-corrosion properties. The coatings were formed on low carbon steel by alternating a layer of resin deposited by dipping or spraying to a layer of dry metallic powders deposited by fluidized bed. Baking in convection oven at 250 degrees C for 45 min allowed the full consolidation of the composite coatings. The visual appearance of the coatings and the uniformity in them of the powder distribution were assessed by scanning electron microscopy. The favorable erosion-corrosion endurance of the developed coating systems were investigated by progressive load scratch tests, dry sliding linear reciprocating tribological tests and dipping in acid and salty solutions. In conclusion, the good protection grade the coatings are able to provide together with the viability of the manufacturing process ensure a high potential of the proposed technology in several industrial domains. (C) 2013 Elsevier B.V. All rights reserved.