In situ spectro-electrochemical studies on the oxidation mechanism of brass

Brass corrosion in tap water distribution systems inhibited by phosphate ions

“…The presence of Cu 2 O when brass is in contact with ATW can be confirmed by the absorbance peaks at 450 nm. There is also a peak at 260 nm that can be ascribed to Zn(II) oxo-hydroxides [4,28,32]. When 10 mg l -1 P is incorporated, the intensity of the absorption peaks decreased, as did the charge associated to the oxides reduction ( fig.…”

“…In the spectra obtained at -0.4 V SCE (Fig. 5) there is also a peak at 260 nm, which could be ascribed to zinc(II) oxide-hydroxides [4,28,32]. However, information on how to assign the peaks of Zn(II) phosphates or compounds other than oxides is not readily available in the bibliography.…”

Estudio de corrosión galvánica en pares latón/acero inoxidable y latón/fundición de hierro

“…El comportamiento de los latones en medio acuoso puede analizarse a través de sus correspondientes voltamperometrías [20][21][22][23] . Realizando un barrido desde potenciales catódicos hacia el potencial de corrosión, la disolución inicial forma Zn +2 a aproximadamente -1.1 V vs. SCE.…”

Passivity and Corrosion of Cu–xZn (x = 10–40 wt%) Alloys in Borate Buffer Containing Chloride Ions

“…Passivation in slightly alkaline solution, with and without addition of chloride, has not received much attention [15][16][17][18][19][20]. The passivation behaviour of brasses under these conditions is interesting since the passivation of the copper and zinc components occurs at a pH value of 9 [21].…”

“…The passivation of Cu is established as being due to formation of a duplex Cu 2 O/CuO layer [24][25][26], whereas a ZnO/Zn(OH) 2 layer is responsible for passivation of Zn [27][28][29]. Various commercial brasses have been described, for example 61Cu-35Zn-3.25Pb [15], 58Cu-40Zn-1.8Pb and 58Cu-38Zn-3.5Pb [30], Cu37Zn brass [20,22], and a-, (a +b)-and b-brasses [17][18][19]. In our previous work the passivation behaviour of a series of Cu-xZn alloys (x = 10, 20, 30 and 40 wt.%) and Cu and Zn metals was studied in borate buffer, pH = 9.2, by a combination of electrochemical measurements and X-ray photoelectron spectroscopy (XPS) [16].…”