Surface treatment thin coatings

Apphcations of microhardness testing greatly extend the conventional indentation hardness test to glass and ceramics, metaHographic constituents, and to thin coatings or other surface treatments not otherwise testable. 

Metal Treatment. After rolling, the oxide scale on sheet steel is removed by acid treatment (pickling) (see Metal surface treatments). Phosphoric acid, a good pickling agent, leaves the steel coated with a thin film of iron phosphates. This process improves mst resistance but presents a problem if the steel is to be electroplated. 

Plasma surface treatment of many polymers, including fabrics, plastics, and composites, often occurs. The production of ultra-thin films via plasma deposition is important in microelectronics, biomaterials, corrosion protection, permeation control, and for adhesion control. Plasma coatings are often on the order of 1 100 nm thick. 

The extremely widespread use of aluminum metal in construction is possible because its reactivity is greatly reduced by formation of a thin but unreactive film of oxide on the metal surface. Treatment of the oxide-coated metal with a suitable complexing agent tends to restore, at least partially, the reducing power which would be predicted from the high... 

Effect on Confined Systems Corrosion Problems Fracture Fatigue Nano Characterisation Test Methodology Computer Simulation Surface Modification Surface Treatments Surface Problems in Contact Mechanics Fracture Mechanics Coupled Analysis and Experiments Thin Coatings Thick Coatings Contact Mechanics Material Surfaces in Contact Applications and Case Studies Indentation and Hardness Adhesion Bonding. 

This technique originally developed to determine the efficacy of shot peening applied to induce compressive stresses at the surface of metallic work pieces has been adapted to thermally sprayed thin coatings (Knight and Smith, 1993). A thin test strip is being mounted on a holder (SAE Handbook, 1977) and blasted with shot. This treatment leads to curving after removal from the fixture. The peened... 

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