Metals industry crevice corrosion

Rare earth metal salts Aircraft industry. Effective for pitting corrosion, stress corrosion cracking, corrosion fatigue, galvanic corrosion and crevice corrosion by using rare earth metal salts in waters for washing aircraft. Disposal of the waters is environmentally safe [4,6]... 

Practice for Evaluating Stress Corrosion Cracking Resistance of Metals in 3.5% Sodium Chloride Solution Test Method for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by the Use of Ferric Chloride Solution Testing of Metals for the Process Industry Metallic Coatings—Accelerated Corrosion Tests... 

This is a localized form of corrosion, caused by the deposition of dirt, dust, mud and deposits on a metallic surface or by the existence of voids, gaps and cavities between adjoining surfaces. An important condition is the formation of a differential aeration cell for crevice corrosion to occur. This phenomenon limits the use, particularly of steels, in marine environment, chemical and petrochemical industries. 

This type transfers heat from the process liquid to the cooling water across a large number of thinly spaced corrugated plates. They find particular application in food and beverage industry applications or for smaller heat loads in hotels or hospitals. Plate and frame types are widely used because of their compact design and availability of various construction materials. Because localized corrosion and metal wastage can occur within the crevices (crevice... 

Recently, heavy coatings that act as sealants for crevices have been developed for the aircraft and aerospace industries. These coatings contain proprietary inhibitor formulations that are especially effective in minimizing corrosion associated with dissimilar metal fasteners (Moiseeva 2005). 

Atmospheric contaminants often responsible for the rusting of structural stainless steels ate the chlorides and metallic iron dust. Chlorides can originate from concrete (CaCl2) and spraying of salt on the road or from exposure to industry and marine locations. Chlorides promote pitting or crevice attack on stainless steels. As discussed above, the corrosivity of different atmospheres can differ and must be considered when materials are selected. Rural and urban environments without pollutants (chloride) do not corrode stainless steel, even in areas with high humidity. 

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