Metallic corrosion effects stone

Some of the most dramatic environmental effects of acid deposition have involved buildings, statues, monuments, and other structures made of metal and stone. The explanation of this kind of damage is obvious Acids in acid deposition react with metals and with many of the compounds of which rock and other building material are made. For example, corrosion occurs when metals such as iron are exposed to hydrogen ions in the presence of oxygen ... 

Corrosion. A more serious effect and one of great economic importance is the corrosive action of acid gases on building materials. Such acids can cause stone surfaces to blister and peel mortar can be reduced to powder. Metals are also damaged by the corrosive action of some pollutants. Another common effect is the deterioration of tires... 

More damage to stone has occurred due to the corrosion of metallic bars than by any other mechanisms of stone decay. Fortunately, such bars are commonly present in structural units of the building and not in the sculptured regions where their effect would be even more serious. 

Wheels with a thickness of approximately 0.8-2 mm are used to ensure the stability of machines operating at high speeds. Thinner wheels with a thickness of about 0.2-0.6 mm can be used for low-speed machines. An ordinary dressing stone can be used to help restore the cutting effectiveness of used, metal-bonded wheels. Lubricants are used in sectioning to protect against corrosion and to improve cutting quality. 

Shown as one of the five environmental spheres in Chapter 1, Figure 1.2, the anthrosphere is the part of the environment made and operated by humans. The anthrosphere is where pollutants are made and from which they are released with profound effects on aU the other environmental spheres. It is also strongly affected by pollutants, for example, acid rain that canses deterioration of stone structures and corrosion of metal components. 

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