ANALYSIS OF DIFFERENT ENVIRONMENTS INFLUENCE ON COPPER ALLOYS CORROSION RESISTANCE

Abstract

Purpose of this work was to establish relationship between corrosion damages depending on chemical composition, as well as external factors affecting copper and copper alloys in different operating conditions corrosion. Methodology. Object of analysis was actual normative and technical database on standard and prospective copper-based alloys compositions for operation in aggressive environments (atmosphere, gases, salts and alkalis solutions, aqueous mediums). Comparative analysis method in order to substantiate the prospects of special bronzes implementation for manufacture of machines and mechanisms corrosion-resistant parts has been used. Results and discussion. Copper alloys behavior in different operating conditions has been analyzed and factors causing their destruction have been considered. Corrosion damaging relationships with chemical composition, as well as external factors affecting corrosion have been demonstrated. Information on copper alloys corrosion rate in different environments has been given. Issues of copper alloys rational uses in relation to parts and constructions peculiar working conditions have been presented. Relevant information on copper alloys products problem of reliability and durability increasing, one of which solving methods is purposeful choice of material for their manufacturing depending on operating conditions, has been given. Practical value. According to research results, effective practical using of technical copper, brasses, tin, silicon, aluminum, nickel bronzes have been substantiated in terms of their resistance to corrosion damages features. Conclusions. It has been established that copper alloys are characterized by high corrosion resistance in different environments. In marine and ocean environments aluminum bronzes corrosion resistance exceeds in some cases all other copper alloys resistance. It has been concluded that aluminum bronzes and copper-nickel alloys have the highest corrosion resistance among copper alloys.