Surface composition of copper alloys: Influence of outdoor exposure

Holm, Rolf; Kamf, Anders; Sundberg, R.; Martinsson, Klaus

doi:10.1016/0025-5416(80)90043-9

Cited by 2 publications

(1 citation statement)

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“…The corrosion behaviour of Cu-Zn alloys exposed in bulk solution is more commonly investigated [12][13][14][15][16][17] compared to their behaviour at atmospheric conditions. [9][10][11] The mechanism of dezincification of brass is not yet completely conceived, however there are separate theoretical and experimental investigations that suggest a process of an initial selective dissolution of zinc followed by a simultaneous dissolution of copper and zinc and subsequent redeposition of copper on a porous layer. 5,12,13,17,18 The presence of chloride and sulphate ions may influence the degree of dezincification.…”

Section: Introductionmentioning

confidence: 99%

Corrosion induced metal release from copper based alloys compared to their pure elements

Goidanich¹,

Wallinder²,

Herting³

et al. 2008

Corrosion Engineering, Science and Technology

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Despite numerous studies on atmospheric corrosion of copper and copper based alloys, the corrosion induced release processes of individual alloy constituents suffer from significant\ud knowledge gaps. This investigation comprises metal release rate measurements of copper, zinc and tin from some copper based alloys including brass (20 wt-%Zn) and bronze (6 wt-%Sn), and\ud their pure alloying metals, copper, zinc and tin. Data have been generated during a 2,5 year urban field exposure in Stockholm, Sweden and parallel laboratory investigations in a specially\ud designed rain chamber using artificial rain. Brass shows significantly lower annual release rates of both copper and zinc compared to pure metal sheets of its alloy constituents. Zinc is preferentially released compared to copper. Dezincification of brass occurs both at field and laboratory conditions, a process influenced by rain characteristics. Alloying with tin does not largely reduce the release rate of copper from bronze compared to pure copper. No measurable amount of tin is released from the bronze surface

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