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It is then necessary to replenish the bag with a new quantity of oxygen absorber before resealing it. Localized enhanced measures, such as microenvironments, can then be applied to further protect the most vulnerable metal objects in the collection, focusing on the objects that will benefit most. A student investigates a pure metal x back. Preventive care measures for the Birks silver collection at the National Gallery of Canada. Most pollutants come from outdoor sources, but some may originate from inside buildings (e. organic acids, such as acetic acid, are emitted from wood and wood-based products as well as from many alkyd, oil and latex paints). Dilute sulfuric acid, 0.
It may help to develop this discussion in the concluding stages of lesson 1 by additional demonstrations of other metals and acids. For reactions of these acids with iron or zinc, the students simply substitute Fe or Zn for Mg in these equations. The majority of metal objects in museums have stable surfaces if kept at moderate levels of relative humidity (RH) (45–50%). Archaeological metals are often brittle due to the deterioration they have undergone during burial, so they can be prone to cracks and fractures. The acids in fats, oils and waxes will attack copper, resulting in waxy green corrosion products (copper soaps, e. stearates). This form of active corrosion can occur when the humidity is above 55%. A student investigates a pure metal x p. When these are present, wear personal protective equipment (nitrile gloves, mask), bag the object to prevent the products from spreading and consult a conservator about safe corrosion removal and disposal. Gaseous pollutants: enclosures can provide significant benefits against gaseous pollutants, even simple options such as sealable polyethylene bags (Figure 48).
Unless prevention measures are in place, the metal surface will re-tarnish shortly after being polished. Acetic and formic acids are corrosive pollutant emissions that can react with some metals—with lead being by far the most sensitive. Medium-density fibreboard. A student investigates a pure metal x base. Ottawa, ON: Canadian Conservation Institute, 2017. Table 2 provides a summary of gaseous pollutants most harmful to metals, the average outdoor and indoor concentration ranges and their usual sources (adapted from Tétreault 2003, pp. Consequently, before installing any works of art, most particularly silver, the following minimum time allowance must be scheduled for the necessary off-gassing: - For in-the-open well-ventilated surfaces, including walls, display platforms and pedestals: Seven days for lead, five days for silver and four days for all other metals or materials.
The experiment is done first on a smaller scale using test tubes (lesson 1 below), with no attempt to recover the salts formed. Handle objects in their boxes and storage trays carefully using appropriate techniques and equipment. For more preservation strategies on water and RH, consult Agent of deterioration: water and Agent of deterioration: incorrect relative humidity. These may be parcel-gilt (i. e. made of silver where only part of the surface is gilded), and in these cases, it can happen that the tarnish on the silver creeps over the gilding. Nevertheless many students find it difficult to achieve a successful 'pop' test for hydrogen, so you may need to do follow-up demonstrations as well. Chloride-contaminated copper alloys (e. objects of archaeological or marine origin): use airtight enclosures (e. containers or bags) with a desiccant so as to maintain the RH as low as possible. Used most frequently to describe such a layer on silver or copper due to a reaction with sulfur. Stainless steel 304, active. Also, a rapid decrease in the external temperature can cause the indoor RH to increase, which is conducive to corrosion.
Sulfur-containing gases (H2S, COS and SO2) affect metals in general, but in particular, they react with silver, copper and copper alloys, causing them to tarnish (Figure 36). Photographs can be very useful. However, since June 2017, as part of the major redesign of the Canadian and Indigenous Galleries, which introduced a new aesthetic and reconfiguration, the silver objects are now shown in new high-tech custom-built display cases, such as free-standing, wall-mounted and inset-type vitrines (Figure 72). Pewter: - Alloy of tin (typically 80–90% by weight of tin) with lead (in the case of old pewter, common in the Middle Ages) or antimony (modern pewter).
Those demonstrating active corrosion (as described under Stable surfaces versus active corrosion) require further action. Copper and copper alloys (bronze and brass). Avoid frequent polishing; if tarnishing reoccurs, it is a sign that the silver needs a more enhanced level of protection (such as increasing the enclosure thickness [e. double bag], improving airtightness, installing filters specifically for that area, using more desiccant or using a sorbent more effective against sulfur gases). Pollutant protection can be further enhanced using sorbents (outlined in Pollutant sorbents). Depending on the leakage rate of a given display case and the RH level sought, the amount of Desi Pak required varies. Gasketed containers: these commercially available containers (e. Lock & Lock food containers) are made either entirely of fairly thick polyethylene plastic (and are milky clear) or of a clear glass bottom with a plastic lid.
More abrasive damage will occur with frequent or vigorous polishing or if hard abrasive compounds are used. 9. : Objects Specialty Group of the American Institute for Conservation, 2002, pp. Hydrogen gas forms as the metals react with the acid to form salts. Organic coatings on metals (oils, waxes, varnishes, lacquers, etc. )
Formic acid (HCOOH): 200 (lead); 8000 (copper). Conserv O Gram 4/16. Sources: coal combustion, coastal ocean, soils, wetlands, oxidation of carbonyl disulfide (CS2) (sources of CS2: rotting organic matter in oceans, soils and marshes, fungal growth). Water (an electrolyte).
Passivating layer: - Thin protective corrosion layer (or oxide layer) on a metal surface which reduces the metal's corrosion rate. Use products that are known to be safe for making mounts, boxes, cabinets, display cases (e. acid-free matboard, acrylic or polyethylene plastic panels, silicone-free sealants, metal, glass). Sources: household cleaning products (window cleaning fluids), concrete dust, emulsion adhesives and paints, alkaline-type silicone sealants, visitors. Active state: - Condition in which a metal reacts with its environment (i. freely corrodes) because it is thermodynamically unstable and the corrosion products are soluble. Each new order, even if it is the same fabric from the same supplier, is tested before use. The multi-level approach towards protecting a metal collection from corrosion involves identifying metal objects that are unstable or more at risk in order to provide them with tailored, enhanced protection. As time has shown, the Pacific Silvercloth liners in storage as well as the controlling agents (desiccants and activated charcoal) in the well-designed and air-tight standard and system display cases perform at full capacity up to 10 years before they need to be replaced.
To restore the original brilliance of the silver, the sulfide film must be removed. Metals can be artificially finished or patinated with a variety of chemical and physical techniques, and it is important to identify these original finishes from other possible surface layers. Providing for air circulation, as this may prevent local concentrations of high humidity enough to at least slow down the rate of corrosion. These compounds are often present or adsorbed into dust particles. There are many common examples such as steel cans plated with tin (commonly known as tin cans Footnote 1), chrome-plated car parts or steel containers galvanized with zinc (Figure 3a). Note: Tin-plated iron objects such as cans, some dishes and various kitchen utensils are often miscalled tin.
Stable surface: Stable plated surfaces, particularly those plated with gold, silver, nickel and chromium, often retain their original bright metallic appearance when kept under appropriate environmental conditions, although the shine may be obscured by grime or dirt. Alternatives include Sorbead Orange desiccant. Understanding corrosion. The desiccant, in the form of Desi Pak, has been maintained in the same ratio as with the previous display cases, while the charcoal cartridges have been replaced with custom-sewn Reemay (non-woven polyester fabric) bags containing 4 mm pellet activated carbon charcoal (virgin coal) (Figure 74). Usually, heating silica gel at about 100ºC for 8–10 hours totally removes its adsorbed water: the silica gel is then desiccated and ready for use to create an RH close to 0% within a sealed enclosure. Harder abrasives such as pumice (hardness about 6 on the Mohs scale) remove more material with each stroke and so cause more damage: if polishes containing the harder abrasives (such as all-purpose metal polishes) are used on silver plate, they rapidly remove the entire silver layer, revealing the underlying base metal; if they are used on sterling silver, they can rub away delicate engravings. Also avoid older silica gel that contains the blue indicator cobalt chloride, since it might be carcinogenic (consult Conserve O Gram 2/15 Cobalt Indicating Silica Gel Health and Safety Update [PDF format, 224 KB]). Unfortunately the chlorides of magnesium and zinc are not easy to crystallise, while magnesium sulfate is so soluble that it takes longer to evaporate sufficiently. Sodium chloride (salt) from fingerprints reacts with silver to form silver chloride, which is light sensitive and can darken over time, resulting in fingerprint stains that are highly visible and obtrusive on polished pieces. Lead will corrode if exposed to merely 400 μg m-3 of acetic acid or to 200 μg m-3 of formic acid (Tétreault 2003).
However, polyethylene bags are not efficient in maintaining a low RH environment with desiccants because the polyethylene (here, low-density polyethylene [LDPE]) is a weak water vapour barrier material over the long term, and most bags provide only a thin barrier layer as compared to the wall thickness of a solid tight-fitting (e. gasketed) plastic box. Write a word equation for the reaction between zinc and sulfuric acid. Consult Agents of deterioration for a broader selection of strategies that can be applied for each specific agent. Placing small digital temperature and RH indicators inside the display case allows for easy monitoring. The metal ions (in the example of Figure 10, the iron ions Fe2+) either remain in solution or react with surrounding species and precipitate, forming corrosion products. Volatile organic compound. Avoid touching metal surfaces with bare hands. Chilton, J. P. Principles of Metallic Corrosion. Airtight materials with low moisture permeability should be used to optimize performance. ½ O2 (gas) + H2O + 2e- → 2OH-.
While other metal/acid combinations react in the same way, recovering the salt by crystallisation (in Lesson 2) may not be as successful as it is using zinc and sulfuric acid. Use the student handout available with this resource and get the students to answer each question after observing the reaction. Figures 56a and 56b. Combined effects of pollutants and contaminants with relative humidity. Similar damage also occurs when salt contaminates a metal: if moisture is present, the salts hydrate and increase in volume, thus fracturing the cohesion of the surface layers and causing losses. The film must remain totally removable whenever necessary. Do most metals react with acids in the same way? While it is supplied in various forms and sizes, the eight-unit non-woven polyethylene (Tyvek) bag has proven to be well suited for our display cases, as it fits easily into the perforated Plexiglas compartments of the system cases (Figures 70 and 71) as well as under the deck or landscape blocks of the standard cases, where space is limited.