Mention the two types of atmospheric corrosion.
Answers
Answer:
Two types of atmospheric corrosion are- outdoor and indoor atmospheric corrosion
Outdoor atmospheric corrosion occurs whenever the metal surface becomes wet with moisture and is aggravated by chloride deposition and sulfur dioxide absorption.
Indoor corrosion is aggravated by a number of compounds depending on the types of activity occurring in the building.
Answer:
Ao Atmospheric Corrosion
M. TULLMIN
CSIR North America Inc.
Houston, Texas
P. R. ROBERGE
Department of Chemistry and Chemical Engineering
Royal Military College of Canada
Kingston, Ontario, Canada
A. INTRODUCTION
Atmospheric corrosion can be defined as the corrosion of materials exposed to the air and its
pollutants, rather than immersed in a liquid [I]. Atmospheric corrosion can further be classified into
dry, damp, and wet categories. This chapter deals only with the damp, and wet cases, associated with
corrosion in the presence of microscopic, "invisible" electrolyte (or moisture) films and visible
electrolyte layers on the surface, respectively. The former thin moisture films are created at a certain
critical humidity level, while the latter are associated with dew, ocean spray, rain water, water
splashing, and so on.
B. TYPES OFATMOSPHERES
Atmospheric corrosion severity tends to vary significantly in different locations and, historically, it
has been customary to classify environments as rural, urban, industrial, marine, or combinations of
these. These types of atmosphere have been described as follows [2]:
Rural—This category is generally the least corrosive and normally does not contain chemical
pollutants, but does contain organic and inorganic particulates. The principal corrodents are
moisture, oxygen and to a lesser extent carbon dioxide. Arid or tropical types represent
special extreme cases in the rural category.
Urban—Similar to the rural type in that there is little industrial activity. Additional
contaminants are of the SO* and NO* variety, from motor vehicle and domestic fuel
emissions.
Industrial—These atmospheres are associated with heavy industrial manufacturing facilities and
can contain concentrations of sulfur dioxide, chlorides, phosphates, and nitrates.
Marine—Fine wind swept chloride particles, deposited on surfaces, characterize this type of
atmosphere. Marine atmospheres are usually highly corrosive, and the corrosivity tends to be
significantly dependent on wind direction, wind speed, and distance from the coast.
Explanation:
mark as Brilliant