Corrosion comparison: Mitreh Cold scale remover solution (MDA0102) vs. hydrochloric acid
1404/08/24
What is the Langelier Index? A Complete Guide to Predicting Water Sedimentation and Corrosion
1404/08/21
Measuring Carbonate and Bicarbonate in Water: A Complete Guide to Alkalinity Control
1404/08/19
Warning signs that indicate the need for chemical cleaning of the heat exchanger
1404/08/17
atmospheric-corrosion-inhibition
A) Inhibition by vapor phase inhibitors
Some organic compounds with low vapor pressure of about 10-2 to 10-7 mm Hg evaporate in a closed space and become liquid on the surface to be protected. These inhibitors increase the corrosion resistance of the metal in corrosive environments. Vapor phase inhibitors are particularly useful for preventing atmospheric corrosion. Atmospheric corrosion results from the single or combined action of moisture, oxygen, and atmospheric pollutants such as SO2, NO2, as well as rain, snow, dust, soot, ash, wind, and radiation.
Vapor phase inhibitors are used to protect electronic equipment during transportation. In a warehouse storing metal equipment for construction, a vapor phase inhibitor is used in the atmosphere. Most vapor phase inhibitors are low molecular weight amines. The amount of inhibitor present is small, but it evaporates sufficiently and becomes liquid to form a protective layer on the metal surfaces. Dicyclohexyl nitrite is widely used in industry.
Types of vapor phase inhibitors include:
1) Interface inhibitors
2) Layer-interface inhibitors
Interface inhibitors reduce the rate of electrochemical reactions at the metal-electrolyte interface. Layer-interface inhibition is achieved by substances that dissolve in the electrolyte layer. Vapor phase inhibitors are oil or water soluble and can be used in the form of powders, sprays, impregnated papers, and foams.
B) Surface modification inhibition
These inhibitors can be used either from the beginning, when the system is free of corrosion, or at any other time when the system is exposed to corrosion. Therefore, these inhibitors are used on clean surfaces as well as on surfaces that have been slightly corroded.
The following methods can be used to modify the surface of some materials.
1) Chemical conversion coatings that may be applied to clean metal surfaces or surfaces during operation.
2) Paint modifiers or stabilizers that may be applied to a relatively clean surface during part processing.
3) Use of oil-based inhibitors
4) Modification of chemical components adsorbed to the metal surfac
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Corrosion comparison: Mitreh Cold scale remover solution (MDA0102) vs. hydrochloric acid
1404/08/24What is the Langelier Index? A Complete Guide to Predicting Water Sedimentation and Corrosion
1404/08/21Measuring Carbonate and Bicarbonate in Water: A Complete Guide to Alkalinity Control
1404/08/19Warning signs that indicate the need for chemical cleaning of the heat exchanger
1404/08/17
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