The higher the relative humidity (65% and above), the higher the risk of corrosion. Temperature also affects relative humidity, thus should be monitored and controlled.
Higher temperatures increase the rate of chemical reactions and corrosion. Incorrect Temperature and Relative Humidity Fingerprints, salts, fatty acids, and polish residues can also cause corrosion. Most common pollutants include dirt, soot, dust, and chemicals. Short term exposure to water "can result in rapid surface corrosion, such as when flash rusting occurs on iron or steel objects that have been even momentarily wetted." Iron and steel are most affected by water.Ītmospheric pollutants are one of the more common agents of deterioration for metals, with tin and tin alloys most affected and resulting in corrosion. The more oxygenated the water is, or the higher quantity of salt present in the water, will cause a more rapid and aggressive corrosion to metal. Low melting point alloys, such as pewter or lead-tin, are at risk of damage due to fire, though other metals are not at risk from the fire itself, but the pollutants caused by smoke.Ĭontact with water, or a complete immersion in water, will lead to some degree of corrosion. Physical force is one of the most common means of damage to metal objects, which “are considered to be strong and resilient though exhibit weakness and brittleness under certain conditions.” This includes breakage, dents, and scratches which occur in accidents, improper storage and mounting, mishandling, and over-polishing. In case of salty and sweet water finds essential are amount of gases dissolved in water, depth of water, direction of currents, and microscopic and macroscopic living organisms.Īgents of Deterioration Physical Force Amount of gases, humidity, depth and composition of soil are very important. With inorganic materials are these processes considerably longer and more complex. Organic materials usually fail in a relatively short period of time, primarily due to biodegradation. Deterioration of materials associated with metalsĪssociated materials deteriorate depending on the origin whether they are organic or inorganic materials. In cases of marine or fresh water finds the most important factors of decay are the amount and composition of soluble salts, water depth, amount of dissolved gases, the direction of water currents and the role of both microscopic and macroscopic living organisms. As the most influential factors of deterioration of historical objects should be pointed out as the relative humidity and air pollution while in archaeological objects a crucial role has composition, depth, humidity and amount of gasses in the soil. Rust and dirt on metal as a result of corrosion and pollution.Īn essential cause of deterioration is corrosion of metal objects or object deterioration by interaction with the environment.
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