Study of two new aqueous alkaline Copper cleaning solutions and comparison with a conventional bath

Otero, E.; Bastidas, J. M.

doi:10.1002/maco.19960470906

Cited by 7 publications

(1 citation statement)

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“…This phenomenon may be attributed to the formation of cuprite (Cu 2 O). 263 In conclusion solutions A and B are excellent for cleaning tarnished copper, 264 the metal is not attacked and the surface finish is untarnished. For practical purposes it is unnecessary to use corrosion inhibitors.…”

Section: X-ray Photoelectron Spectroscopy Analysis Of Copper/bta Systemmentioning

confidence: 90%

Copper deterioration: causes, diagnosis and risk minimisation

Bastidas¹,

Criado²,

Fajardo³

et al. 2010

International Materials Reviews

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Copper is widely used in many applications such as heat exchangers, condensers, heating and air conditioning systems, electricity, electronic circuitry and ornamental parts. This paper reviews the issue of copper corrosion in different environments and applications. Special attention is paid to the influence of relative humidity and low molecular weight carboxylic acids. These acids are present in rain, snow, clouds and particulate matter and contribute about 15-35% of rain acidity. Attention is also paid to copper corrosion originated by formic, acetic, propionic and butyric acid vapours. Corrosion product layers (patina) are analysed, showing the relationship between potential and current density cathodic peaks, and models are proposed that show a proportionality factor of the dimensions of a resistor. These results are of practical importance in copper roofing applications. Before 1985, copper was almost universally considered to be a corrosion resistant conduit of potable water, and few instances of copper tube failure were reported. Where unacceptable performance was identified, the problem was usually attributed to reticulation and plumbing systems. In air conditioning applications, premature failure of copper tubing frequently occurs due to pitting corrosion after a short time in service or even during postinstallation leakage tests. This type of corrosion is described in the literature as formicary corrosion, and its morphology is characterised by microscopic caverns connected by tunnels. Specimens are analysed to assess the reasons for such premature corrosion failure. Finally, procedures to mitigate copper corrosion are addressed. Pickling in dilute mineral acids (H 2 SO 4 and HCl) is discussed as the most common method for removing oxides formed on the surface of copper based materials during mill processing and manufacturing operations. The use of corrosion inhibitors, such as immersion corrosion inhibitors and volatile corrosion inhibitors (VCI), is a widespread practice to reduce copper corrosion, achieving significant delays in the corrosion process. Reference is made to the search for new environmentally friendly inhibitors for copper and bronze using organic compounds in acid, neutral and alkaline media, and a number of ecological alternatives are reviewed.

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Section: X-ray Photoelectron Spectroscopy Analysis Of Copper/bta Systemmentioning

confidence: 90%

Copper deterioration: causes, diagnosis and risk minimisation

Bastidas¹,

Criado²,

Fajardo³

et al. 2010

International Materials Reviews

View full text Add to dashboard Cite

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Copper corrosion inhibition by fast green, fuchsin acid and basic compounds in citric acid solution

Cano

Pinilla

Polo

et al. 2003

Materials & Corrosion

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Fast green (FG), fuchsin basic (FB) and fuchsin acid (FA) were studied as copper corrosion inhibitors in citric acid solution. Five citric acid concentrations were tested from 0.001 to 1.0 M. Twelve FG, FB and FA concentrations were studied from 1 × 10−5 to 1 × 10−1 M, at four temperatures from 298 to 328 K. The gravimetric method was employed to study the protective effect of FG, FB and FA. The order of inhibition efficiency was FB > FA > FG. Conventional adsorption isotherms were tested to fit the experimental data. The best fit was obtained using the Frumkin isotherm model. A thermodynamic/kinetic model of adsorption was also fitted. The projected molecular area of the inhibitors was calculated to elucidate inhibitor orientation in the adsorption process.

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