Protective coatings according to DURACHROM technology, used as anti-corrosion protection on cylinder rods and core prints of hydraulic props, are more resistant to corrosion-forming agents than conventional coatings, and the applied materials and production processes do not constitute any hazard for the natural environment.
The presented range of production solutions effectively replaces all standard anti-corrosion coatings of galvanic type such as chromium, nickel, nickel-chromium etc., however with some minor economic limitations. Confrontation with electroplating entailed comparing unit prices of making one square decimetre of the reference coatings. So far, DURACHROM coatings do not win such confrontation for typical sizes of rods and core prints with diameters smaller than 80 mm, at lengths below ca. 0.5 m. In relation to a high content of chromium and nickel DURACHROM coatings are resistant to atmospheric corrosion, natural water (including marine water and mine water), medium-concentrated saline solutions, alkaline solutions, low-concentrated organic acids and the majority of inorganic acids.
As compared to typical electroplated chromium coatings, DURACHROM coatings are far more elastic – they do not crack at high compressive (tensile) stress in the rod or core print core or do not chip as a result of spot, local dynamic loads of the coating surface.
As compared to electroplated copper coatings, DURACHROM coatings have a much higher resistance to corrosion and mechanical strength, particularly as far as resistance to wear is concerned. The best technical and economic effects of using DURACHROM technology coatings can be observed at repairs of external surfaces of rods and core prints of large hydraulic cylinders, props and brackets in particular. The benefits result not only from a large quantity of the renovated surface dm2 but also from significant savings as a result of the possibility to eliminate padding to ensure the renovated surface recovery to the nominal dimension after the repair, even if the depth of corrosion pits exceeded ca. 0.5-0.7 mm.
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* it is possible to apply external coats in special version: