Profile: Acorn Surface Technology is a supplier of specialist surface engineering processes. We are certified with ISO 9001:2000 quality accreditation. We specialize in the provision of surface coating technology on precision engineered components. Our mainstream services are hard anodizing, sulphuric & chromic anodizing, aerospace-standard wet paint processes, IVD aluminum vacuum coating, electroless nickel plating, PTFE & lubricated coatings, chromate & non-chromate conversion coatings, and passivation. We serve application sectors like aerospace, defense, marine, automotive, oil & gas, renewable energy, electronic, space, communications, machine tools, and hydraulic & pneumatic system applications. Chromate conversion coatings are produced on aluminum by chemical methods. The coatings are usually applied by immersion, spray, or swabbing. The appearance of the film can vary from a silver color to dark yellow, depending on the solution composition. Chromate films are thin, and give supportive corrosion resistance with low electrical resistance.