Corrosion protection inorganic material

Pathak, SS, Khanna, AS, Sinha, TIM. 2006. Sol-Gel Derived Organic-Inorganic Hybrid Coating A New Era in Corrosion Protection of Material. Corros. Rev., 24, 281. 

Typical transfer molding compositions for encapsulation of electronic devices are mixtures of an epoxy novolac resin, a phenolic resin hardener, a catalyst, large amounts of inorganic filler (e.g., Si02) flame-retardant ingredients, internal lubricants, carbon black, and sometimes other additives such as getters to trap ionic impurities (34,35), corrosion-protection materials, and stress-relief ingredients. 

An important corrosion-protection measure for metallic materials is the application of metallic, inorganic, or organic coatings. Metallic coatings can be applied by ... 

A number of new polymer composites based on conducting polymers combined with various inorganic materials have recently been described. Polypyrrole and oxide composites have been prepared by the incorporation of Fe304 particles into the CP matrix [77,151]. The oxide particles increased the corrosion protection of the films for iron in a 3% NaCl medium, apparently by increasing the oxidizing properties of the film [77] or by helping to maintain the polymer in its oxidized state [151]. 

N. Pirhady Tavandashti, S. Sanjabi, and T. Shahrabi, Evolution of corrosion protection performance of hybrid silica based sol-gel nanocoatings by doping inorganic inhibitor, Materials and Corrosion, vol. 62, no. 5, pp. 411-415, 2011. 

Treatment based on inorganic corrosion inhibitors has provided, on the one hand, a reliable measure of corrosion protection in aqueous systems, but on the other, however, the discharge of such materials has become increasingly unacceptable. 

As explained in Chap. 14, anodizing is a widely use technique to produce a protective inorganic coating of some engineering materials such as aluminum, magnesium, titanium and a few other metals and alloys by the application of an anodic potential that would be normally quite corrosive if it was not for the barrier created by the process itself. Of all metals that are routinely anodized, aluminum alloys are... 

Austenitic stainless steels and hardenable stainless steels such as martensitic, precipitation hardening, and maraging stainless steels are seldom coated, but their corrosion resistance depends on the formation of naturally occurring transparent oxide films. These films may be impaired by surface contaminants such as organic compoimds or metallic or inorganic materials. Treatments are available to clean and degrease the surface of these materials to produce uniform protective oxide films. These usually involve immersion in an aqueous solution of nitric add and a dichromate solution. 

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