Objetivo Hexavalent chromium compounds are extensively utilised in the surface treatment of metals and metal plated surfaces. The technique is commonly known as conversion coating or surface chromating. The purpose of this method is to increase resistance to corrosion and oxidation, eg. prior to coating and painting. Applications include zinc, cadmium, tin and silver metal platings and uncoated metals such as steel, silver, copper and its alloys.The utilisation of Cr(VI) compounds is under threat in response to the highly corrosive and toxic nature of these materials. High concentrations of Cr(VI) compounds are used during the treatment process creating severe safety and effluent problems. Pre-competitive research is therefore essential to identify effective substitutes and maintain industrial competitiveness.It is proposed to investigate the mechanism by which Cr(VI) exerts its influence on the corrosion resistance of metal surfaces. The techniques and understanding developed will then be applied to the study of substitute processes. Two general approaches will be adopted. Firstly, a method will be explored which involves handling Cr(III) chemicals only. These have a very low toxicity and are not corrosive. Generation of the active Cr(VI) species will only take place in situ by electrochemical polarization of the metal being treated. Cr(VI) will therefore only be present in the film attached to the metal surface.Secondly, it is proposed to examine alternative systems with no chromium present eg. other oxidising species with very positive redox potentials such as vanadates and appropriate complexing agents such as organic acids.The methods involve the use of much less hazardous and toxic chemical with a greatly diminished environmental impact. The combination of the new approaches proposed and the strong pressures to replace Cr(VI) provide a powerful incentive for the initiation of research into this topic. Ámbito científico natural scienceschemical sciencesorganic chemistryorganic acidshumanitiesartsvisual artsnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural scienceschemical sciencesinorganic chemistrypost-transition metalsengineering and technologymaterials engineeringcoating and films Programa(s) FP3-ENV 1C - Specific research and technological development programme (EEC) in the field of the environment, 1990-1994 Tema(s) 0202 - Technologies for protecting and rehabilitating the environment Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador EA TECHNOLOGY LTD. Aportación de la UE Sin datos Dirección Capenhurst CHESTER Reino Unido Ver en el mapa Enlaces Sitio web Opens in new window Coste total Sin datos Participantes (3) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo FUNDACION INASMET - ASOCIACION DE INVESTIGATION METALURGICA DEL PAIS VASCO España Aportación de la UE Sin datos Dirección 12,Mikeletegi Pasealekua 2 20009 SAN SEBASTIAN Ver en el mapa Coste total Sin datos Inter Euro Technology Ltd Irlanda Aportación de la UE Sin datos Dirección Green Road 41 Carlow Ver en el mapa Coste total Sin datos NATIONAL LABORATORY FOR ENGINEERING AND INDUSTRIAL TECHNOLOGY Portugal Aportación de la UE Sin datos Dirección Estrada do Paco do Lumiar 22 1649-038 LISBOA Ver en el mapa Coste total Sin datos
