Real time corrosion monitoring in atmosphere using automated battery driven corrosion loggers

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An automated corrosion monitoring system using the electrical resistance technique was applied for assessment of the corrosivity towards carbon steel and zinc in different phases of a complex accelerated corrosion test recently introduced by VDA, an association of German car makers. It comprises salt spray, wet, dry, and freezing phases. The developed small and battery-driven atmospheric corrosion loggers provided high sensitivity allowing for subangstrom (<10 À10 m) measurements of corrosion depth and good accuracy. The actual corrosion rate was affected by the exposure history due to a limited rate of wetting/drying and oxygen and ion transport to the reaction interface under a layer of corrosion products. The hysteresis was particularly strong for carbon steel. Except the freezing phase, the steel corrosion rate varied in a narrow range from 0.2 to 0.6 mm/h. For zinc, the corrosion rate varied from 0.001 to 0.1 mm/h in particular phases of the cycle with the maximum in the salt spray phase. Seventy-five percent of the metal corroded in the salt spray phase and in the following drying period representing only 13% of the total test time. The obtained data suggest that the proposed test cycle allowed for rather efficient drying of the zinc surface, which is believed to be crucial for the formation of corrosion products with certain protective ability observed also in field conditions.

“…The corrosion depth (CD) of the metallic sensor is calculated according to equation

CD = t_{init} (\frac{R_{ref,init}}{R_{sens,init}} - \frac{R_{ref}}{R_{sens}})

Section: Methodsmentioning

confidence: 99%

Application of automated corrosion sensors for monitoring the rate of corrosion during accelerated corrosion tests

Prošek

Bozec

Thierry

2012

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“…The corrosion loss was quantified by the electrical resistance technique using brass ER‐probes. Details on the resistance probes and the electrical resistance technique were published in . Electrical resistances of the sensing and reference parts of the electrode necessary for calculation of the corrosion loss were recorded by ACD‐03 logger (MetriCorr ApS, Denmark).…”

Section: Methodsmentioning

confidence: 99%

Contribution of protein and polysaccharide binders to corrosion of gold‐imitating brass in illuminated manuscripts

Kouřil

Jamborová

Stoulil

et al. 2015

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The survey of 10-century-old illuminations showed that the gold-like areas were made with the use of brass powder. Since this layer has been showing significant damage, it is vital to identify the degradation mechanisms to prevent the priceless manuscript from further deterioration. Degradation of the pseudo-gilded areas, such as darkening of the metal phase and disintegration of the binder, are well visible on the illuminations. The aim of the study was to compare the corrosivity of brass induced by binders using artificial aging tests modelling the conditions for the deposition of illuminated documents in the archives. Egg white, gum Arabic, isinglass and parchment glue were applied throughout the experiments. The samples on brass coupons and electrical resistance probes (ER-probes) were subjected to artificial aging at a high relative humidity and in the air containing acetic acid vapour and the effect of an increased relative humidity on the corrosion behaviour of brass was evaluated. Corrosion depth of the ER-probes versus time was evaluated as well. The results show that the presence of the binder layer on brass increases the corrosion rate of brass at an elevated relative humidity of ambient air. Proteinbased binders resulted in a higher corrosion rate of brass probes compared to that of polysaccharide-based binder -gum Arabic.

“…A corrosion rate of copper in propylene glycol was estimated by means of very precise 50 nm resistometric probes using a Keithley 3706 instrument. The resistometric method and its use are described elsewhere . Three probes were exposed to propylene glycol for 48 h at laboratory temperature, then 24 h at 40 °C and 24 h at 70 °C.…”

Section: Methodsmentioning

confidence: 99%

Influence of temperature and inhibitor content on the lifetime of copper nanoparticles in a propylene glycol‐based nanofluid

Stoulil

Pfeifer

Švadlena

et al. 2015

The present paper investigated the lifetime of copper nanoparticles in a propylene glycol-based nanofluid. The corrosion behavior of nanoparticles was observed by means of linear polarization resistance, resistometry, transmission electron microscopy, and X-ray photoelectron spectroscopy. Copper nanoparticles were tested in pure propylene glycol with the addition of the inhibitors benztriazole, benzimidazole, and tolyltriazole. The best performance was found with tolyltriazole as it provided some inhibiting efficiency even at higher temperatures, i.e., up to 120 8C. A layer of cuprous oxide was observed on the surface after exposure to propylene glycol, but this oxide was defective on the curved surface of nanoparticles. The corrosion rate of nanoparticles was at least two orders of magnitude greater than the corrosion rate of the compact sample. The lifetime of bare copper nanoparticles was not sufficient for practical purposes even when an inhibitor was used.