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Materials and Corrosion 46, (19%)
95-1052
The Development of Chemical Conversion Coatings on Aluminium. (Conference Paper). The growth of the chemical conversion coatings on Al is strongly dependent upon the purity of the metal. For specimens up to 99.99% punty, the Al surface is not homogeneous. flaws are always present in the thin oxide iayer cwenng the Ai surface; such flaws are sited above the grain boundares and cellular boundaries assodated wlth impunty segregation in the Al substrate. These flaws are of the residual type and provtde easy paths for electronic conduction in an otherwise insulating oxide layer. Consequently, coating growth (1.e. the reduction of the dichromate species to hydrated chromium oxide) occurs preferentialty along the grain boundarks or cellular boundaries of the Al substrate.
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drastically decreased life to crack ation compared with uncoated samples, the degradation being attributed to surface pitting and crevice attack by the phosphating process.4RAl R.A. Farrara. J.C. Rier. Materials Research Laboratories (Australia). ADA230 871/61xA6. Dec. 1990, Pp 22, fin English]. ##
Werkstoffe und Korrosion 43, (1992) other marine applications also require these properties. While sheet materials are Msal for m e applications, there are often irregular contours which need protection. This project was started to evaluate advanced thermal spray techniques for applying Cu-Ni coati
nificantly lower push-out strengths than Ti alloy. SEM-investigation of the interfaces revealed that FA did not degrade while both MW and HA showed extensive degradation at 12 and 25 weeks. In addition, the interface after push-out testing showed for the MW, HA, and Ti alloy implants to be fractured
The use of surface layers on cutting tools has increased. The three-pronged development of layer material, layering method and tool use are required to cooperate. A wide range of materials are in use. Methods MSlP and AIP have advantages over CVD in flexibility, choice of materials and ecological cl