Evaluation of protective properties of acrylate varnishes used for conservation of historical metal artefacts

Švadlena, J.; Stoulil, J.

doi:10.1515/kom-2017-0003

Cited by 9 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the corrosion reaction happens in a confined space, the excessive increased volume would induce a noticeable amount of strain, which could be used as an indicator of the corrosion reaction. Based on these principles, recently, electrical resistance sensors have been investigated to detect metallic and organic coating degradations [31,32]. However, electrical strain gauges may have difficulties in applying corrosion assessment due to moisture and intensive electromagnetic noise.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior Evaluation of Coated Steel Using Fiber Bragg Grating Sensors

2019

View full text Add to dashboard Cite

Coatings, either soft or hard, are commonly used to protect steel against corrosion for longer service life. With coatings, assessing the corrosion behavior and status of the substrate is challenging without destructive analysis. In this paper, fiber Bragg (FBG) grating sensors were proposed to nondestructively evaluate the corrosion behavior of steel coated with two popular coatings, including the polymeric and wire arc sprayed Al-Zn coating. Laboratory accelerated corrosion tests demonstrated that the embedded FBG sensors inside both the soft and hard coatings can effectively quantify the corrosion rate, monitor the corrosion progress, and detect the coating damages and crack propagation of coated steel in real time. The laboratory electrochemical corrosion test on the wire arc sprayed Al-Zn coating validated the proposed embedded FBG sensor method with a good agreement in comparison. The proposed sensing platform provides an alternative nondestructive real-time corrosion assessment approach for coated steel in the field.

show abstract

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior Evaluation of Coated Steel Using Fiber Bragg Grating Sensors

2019

View full text Add to dashboard Cite

show abstract

“…It was then cleaned with distilled water and a 1200 grit wet sandpaper and dried with absorbent paper and isopropyl alcohol. To protect it from oxidation a protective layer of Paraloid B72 was utilized, since this resin forms an effective coating against pollutants and water permeability [31]. It was applied dissolved in xylene (10 % w/v) with a brush; the pin being hung up to let the solvent evaporate.…”

Section: Metalsmentioning

confidence: 99%

Model 1859 Portuguese army clothes backpack. Historical note, conservation and restoration treatment

Fernandes

2020

Cons. Património

View full text Add to dashboard Cite

The model 1859 clothes backpack was used to carry soldier's spare clothing and necessaries. It was strictly made according to a pattern and was constructed in a box shape from leather and canvas, painted black on the exterior. An example of this model, which belongs to the Lisbon Military Museum collection (MML02048), was removed from the storage in 2016 in order to be inventoried. It was subsequently restored within the curricular unit “conservation and restoration project” of the Conservation and Restoration Bachelor so it could be placed on permanent exhibition. This object was likely used in campaign in Mozambique in 1894-95 by the bugler António Moura, taking part on the combat of Marracuene. Areas of deterioration, such as f laking paint and canvas losses, were caused mainly by storage conditions and improper care over the course of more than a century. The treatment was guided towards its ideal state, enhancing mostly historical and aesthetical values which were obtained through investigation.

show abstract

“…The process is described in Figure 13, which also contains the record of a resistometric copper probe. Resistometric probes have been described in detail elsewhere [38][39][40][41][42][43][44][45][46][47][48][49][50]. The metallic trace corroded approximately 1 μm in the first cycle, but all consequential cycles dissolved only 0.3 μm of metallic trace.…”

Section: Optimisation Of Patination Processmentioning

confidence: 99%

Artificial Patination of Copper and Copper Alloys in Wet Atmosphere with Increased Content of SO2

et al. 2019

View full text Add to dashboard Cite

Natural copper patina is usually formed over several decades. This work investigates the possibility of obtaining a stable artificial patina based on brochantite in a more reasonable time. The patination process was based on patina formation from a humid atmosphere containing sulphur dioxide. The studied parameters were humidity (condensation and condensation/drying), sulphur dioxide concentration (4.4–44.3 g·m−3) and surface pre-treatments (grinding, pre-oxidation and pre-patination) prior to the patination process. Samples were evaluated by mass change, digital image analysis, spectrophotometry, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). A resistometric method was employed in order to observe the patina formation continuously during the exposure. Conditions inside the chamber were monitored during the exposure (pH of water and concentration of SO2 in gaseous phase). According to XRD, it was possible to deliberately grow a brochantite patina of reasonable thickness (approx. 30 µm), even within a couple of days of exposure. The drying phase of the condensation cycle increased the homogeneity of the deposited patina. Formation kinetics were the fastest under a condensation/drying cycle, starting with 17.7 g·m−3 sulphur dioxide and decreasing dosing in the cycle, with an electrolyte pH close to 3. The higher sulphur dioxide content above 17.7 g·m−3 forms too aggressive a surface electrolyte, which led to the dissolution of the brochantite. The pre-oxidation of copper surface resulted in a significant improvement of patina homogeneity on the surface.

show abstract

Evaluation of protective properties of acrylate varnishes used for conservation of historical metal artefacts

Cited by 9 publications

References 15 publications

Corrosion Behavior Evaluation of Coated Steel Using Fiber Bragg Grating Sensors

Corrosion Behavior Evaluation of Coated Steel Using Fiber Bragg Grating Sensors

Model 1859 Portuguese army clothes backpack. Historical note, conservation and restoration treatment

Artificial Patination of Copper and Copper Alloys in Wet Atmosphere with Increased Content of SO2

Contact Info

Product

Resources

About