The dezincification of brass and its inhibition in acidic chloride and sulphate solutions

Dinnappa, R.K.; Mayanna, S. M.

doi:10.1016/0010-938x(87)90077-1

Cited by 59 publications

(27 citation statements)

References 18 publications

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“…This is in agreement with the dezincification mechanism previously described, i.e. the initial selective dissolution of zinc, followed by simultaneous dissolution of zinc and copper and subsequent re-deposition of copper (Dinnappa and Mayanna 1987;Marshakov 2002;Rehan et al 2001;Selvaraj et al 2003;Sundberg et al 2003). Annual release rates of copper and zinc from brass are significantly lower compared to the pure metals exposed to identical exposure conditions, Fig.…”

Section: Brass: Release Of Copper and Zincsupporting

confidence: 87%

“…(Dinnappa and Mayanna 1987;El-Sherif et al 2004;Mazza and Torchio 1983;Rehan et al 2001;Sastri 2005;Shreir et al 2000;Sundberg et al 2003). According to (Holm and Mattsson 1982), little or no dezincification is expected, neither for α-brasses with 15% zinc or less nor for arsenical α-brasses at atmosphere conditions.…”

Section: Introductionmentioning

confidence: 92%

“…The risk of dezincification can be reduced by alloying with e.g. As, Sn, Pb, Al, P, (Dinnappa and Mayanna 1987;El-Sherif et al 2004;Mazza and Torchio 1983;Shreir et al 2000;Sundberg et al 2003). However, low amount of impurities, e.g.…”

Section: Introductionmentioning

confidence: 95%

“…According to recent experimental and theoretical findings, the first step of dezincification is the selective dissolution of zinc, forming structural defects such as mono-and di-vacancies in the surface layer which increases its free energy, and the subsequent propagation by simultaneous dissolution and re-deposition of copper (Dinnappa and Mayanna 1987;Marshakov 2002;Rehan et al 2001;Selvaraj et al 2003;Sundberg et al 2003).…”

Section: Introductionmentioning

confidence: 96%

“…Even though the mechanism of the dezincification of brass is not completely understood, it is quite commonly accepted that chloride and sulphate ions influence the degree of dezincification and may play an important role in connection with the formation of cuprous compounds, (Dinnappa and Mayanna 1987). Conditions of slow dissolution seem to favour dezincification while conditions that lead to fast dissolution increase the tendency for simultaneous removal of copper and zinc.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion-induced release of Cu and Zn into rainwater from brass, bronze and their pure metals. A 2-year field study

Herting

Goidanich

Wallinder

et al. 2007

Environ Monit Assess

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A 2-year field study has been conducted in an urban environment to provide annual release rates of copper and zinc from brass (20 wt% Zn) and copper and tin from bronze (6 wt% Sn) compared to sheets of their pure alloy constituents, copper and zinc. Despite relatively low nominal bulk alloy content, substantially more zinc was released from brass compared to copper. Both metals were released at a significantly slower rate from the brass alloy, compared to the pure metals. The proportion of release rates of copper and zinc from the alloy differed significantly from their proportions in the bulk alloy. Bronze showed relatively constant release rates of copper, being similar to that of pure copper sheet. The release of tin from bronze was negligible. The results clearly show that alloys and the pure metals behave very differently when exposed to rainwater. Accordingly, release rates from pure metals cannot be used to predict release rates of individual constituents from their alloys. Generated data are of importance within REACH, the new chemical policy of the European commission, where metal alloys erroneously are being treated as mixtures of chemical substances.

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Section: Brass: Release Of Copper and Zincsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Corrosion-induced release of Cu and Zn into rainwater from brass, bronze and their pure metals. A 2-year field study

Herting

Goidanich

Wallinder

et al. 2007

Environ Monit Assess

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ChemInform Abstract: Dezincification of Brass and Its Inhibition in Acidic Chloride and Sulphate Solutions.

Dinnappa¹,

Mayanna²

1987

ChemInform

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024ChemInform Abstract The dezincification process is characterized by the potential-time relationship, which indicates a selective dissolution of Zn at the initial stage followed by simultaneous dissolution of Cu and Zn and subsequent redeposition of Cu. The inhibition effect of surface active compounds such as thiourea, thioglycolic acid, thioglycol and halo-acetic acids has been investigated and is discussed on the basis of models proposed for synergistic effects of organic molecules and anions involved in the medium (see title). Strongly adsorbable but complexing type inhibitors are found to be more effective than non-complexing type compounds.

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Passivation and pitting corrosion of α‐brass (Cu/Zn: 63/37) in neutral buffer solutions containing chloride ions

El-Rahman

1990

Materials & Corrosion

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The passivation behaviour and pitting corrosion of a commercial grade a-brass (CuIZn: 63/37) in neutral buffer solutions (borate and phosphate) in the presence and absence of chloride ions were investigated by electrochemical techniques. The results indicated the dezincification in absence of chloride ions at highly enough anodic potentials and both dezincification and pitting corrosion in the presence of chloride ions. The pitting susceptibility was found to depend on the composition of the buffer solution, chloride ion concentration and nature of the passive layer on the metal surface before pitting. Current transients corresponding to passivity, dezincification and pitting corrosion were identified and analyzed.Das Passivierungsverhalten und die Lochkorrosion eines handelsublichen alpha-Messings (CuZn 63 37) in neutraler Pufferlosung (Borat und Phosphat) mit und ohne Chlorid wurde elektrochemisch untersucht. Die Ergebnisse zeigen, daB in der chloridfreien Losung Entzinkung bei ausreichend hohen anodischen Potentialen auftritt, wahrend bei Anwesenheit von Chloridionen sowohl Entzinkung als auch Lochkorrosion auftreten. Die Anfalligkeit fur Lochkorrosion ist abhangig von der Zusammensetzung der Pufferlosung, der Chloridionenkonzentration und der Art der Passivierungsschicht auf dem Metal1 vor Beginn der Lochkorrosion. Die Stromtransienten fur Passivitat, Entzinkung und Lochkorrosion wurden identifiziert und analysiert.

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The dezincification of brass and its inhibition in acidic chloride and sulphate solutions

Cited by 59 publications

References 18 publications

Corrosion-induced release of Cu and Zn into rainwater from brass, bronze and their pure metals. A 2-year field study

Corrosion-induced release of Cu and Zn into rainwater from brass, bronze and their pure metals. A 2-year field study

ChemInform Abstract: Dezincification of Brass and Its Inhibition in Acidic Chloride and Sulphate Solutions.

Passivation and pitting corrosion of α‐brass (Cu/Zn: 63/37) in neutral buffer solutions containing chloride ions

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