Structure and Corrosion Resistance of Cast ZnAl40Cu2 Alloy

Abstract

Zn-Al-Cu alloys are used as an alternative material for bronze, cast iron and aluminum alloys in bearings and as construction material. Advantageous results brings of their application for bearings exposed to high loads. One of the factors determining the possible applications of Zn-Al-Cu alloys is their resistance to electrochemical corrosion. In literature can be found information on the corrosion resistance of Zn-Al-Cu alloys. There have been no comprehensive studies on the influence of casting conditions and modifications of chemical composition on the structure and corrosion resistance. The purpose of the experiments was to determine the structure and corrosion resistance of cast Zn-40%Al-2%Cu alloy. The scope of the experiments included X-ray phase analysis, potentiodynamic and potentiostatic tests, surface condition examinations and alloy structure characterization both before and after corrosion. The Zn40Al2Cu alloy is characterized by a dendritic structure, consisting of solid solutions of Al, Zn-Al and Zn and the CuZn5 phase. A corrosive environment affects the structure of the subsurface zone of the Zn40Al2Cu alloy to a depth of 60 to 130 μm, where a decrease of zinc content and an increase of aluminum content are observed.

Structure and mechanical properties of ZnAl40Cu3 alloy modified with rare earth elements

“…, Table . Basing on the results of X‐ray phase analysis, X‐ray microanalysis and literature data, it can be assumed that this is a CuZn 5 phase [, ]. In the structure of the alloy occured lighter and darker areas.…”

Study On Nanohardness Of Phases Occurring In ZnAl22Cu3 And ZnAl40Cu3 Alloys

“…1a, Table 1). Results of researches published in [13] can provide to a conclusion that it is the CuZn 4 phase. Soaking of the ZnAl40Cu3 alloy at the temperature of 185…”

Influence of nickel addition on the microstructure, mechanical, and wear properties of Zn‐40Al‐2Cu alloy

“…Zn-40Al-2Cu alloy was developed after intensive research on zinc-based alloys [1][2][3][4][5][6][7][8]. This alloy has the highest hardness, strength, and wear resistance among the zinc-aluminum-based ternary alloys containing a small amount of copper [9,10].…”

“…However, the tribological properties of Zn-40Al-based ternary and quaternary alloys have not been studied at pressures above 6 MPa. The influence of silicon addition on the microstructure and general properties of Zn-40Al-2Cu alloy has been studied in detail [4,5,13]. As a result of these studies, a quaternary Zn-40Al-2Cu-2Si alloy was developed [9,10,12].…”