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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 coatings to such areas. Dense, strong, adherent clads of Cu and SOCo-1ONi up to 3.18 mm thick have been deposited on structural steel panels by arc-wire spray and spraylpeen processes. High quality spray deposits have been made both in air and under water. Techniques for spray forming free standing etructures that can be cemented to curved surfaces with an electrically insulating layer have been developed. Anaerobic sealants and spray peening have been found to seal porosities and block galvanic coupling of clads sprayed directly on steel. Results of sea tests of sealed clads on steel show effective protection from biofouling. Spray cladding is applicable to coating of large structures in the shop or field at costs competitlve with sheathing. The ability to detect cracks in steel weids beneath thick clads by nondestructive inspection has been demonstrated. Sprayclad technology Is adequate for immediate application to offshore structures or ship hulls. Graphs, Photomicrographs.
๐ SIMILAR VOLUMES
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.
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]. ##
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