Buildings chemical/atmospheric protection

Included in this estimate was corrosion attributed to chemical processes corrosion of highways and bridges from deicing chemicals atmospheric corrosion of steel fences atmospheric corrosion of various outdoor structures such as buildings, bridges, towers, automobiles, and ships and innumerable other applications exposed to the atmospheric environment. It has been further estimated that the cost of protection against atmospheric corrosion is approximately 50% of the total cost of all corrosion-protection methods. 

Regional scale episodes of elevated concentrations of photochemical oxidants occur every summer in Europe. During summertime, anticyclonic weather conditions, ozone concentrations steadily build up over several days and may exceed internationally-accepted criteria values (ref) set to protect human health, crops and trees [22]. There are no emissions of ozone into the atmosphere and all the ozone found close to the ground in pollution episodes has been formed there by chemical reactions involving the precursors, hydrocarbons and the nitrogen oxides, in the presence of sunlight. 

Paints and coatings are used to protect substrates against mechanical, chemical, and atmospheric influences. At the same time, they serve to decorate and color buildings, industrial plants, and utensils. 

In dynamic testing of ozone resistance, a fabric-backed vulcanized rubber specimen is continuously flexed in the ozone chamber over a roller. The fabric backing is in the form of a belt. Any protective chemical films (e.g., certain waxes and antiozonants) that might build up on the surface of the specimen in static testing are quickly broken by the continuous flexing. ASTM test method D 1149 covers static testing and D 3395 covers dynamic testing in a controlled ozone atmospheres. 

Anchorage located in controlled environments inside buildings may not require protection from atmospheric corrosion except for exposure to chemicals. 

---