Corrosion

A coating is a covering that is applied to an object to protect it or change its appearance. They may be applied as liquids, gases or solids. ...more on Wikipedia about "Coating"

Cold cracking is a defect that occurs in welding and requires all of the following 4 things: ...more on Wikipedia about "Cold cracking"

Corrosion is deterioration of intrinsic properties in a material due to reactions with its environment. Weakening of steel due to oxidation of the iron atoms is a well-known example of electrochemical corrosion. This type of damage usually affects metallic materials, and typically produces oxide(s) and/or salt(s) of the original metal. Corrosion also includes the dissolution of ceramic materials and can refer to discoloration and weakening of polymers by the sun's ultraviolet light. ...more on Wikipedia about "Corrosion"

Decarburization is the process opposite to carburization, namely aimed at decreasing the content of carbon in metals (usually steel). ...more on Wikipedia about "Decarburization"

The Galvanic cell, named after Luigi Galvani, consists of two metals connected by an electrolyte which forms a salt bridge between the metals. It is also known as a voltaic cell and an electrochemical cell. In 1780, Luigi Galvani discovered that when two different metals (copper and zinc for example) were connected together and then both touched to different parts of a nerve of a frog leg at the same time, they made the leg contract. He called this " animal electricity". The Voltaic pile, invented by Alessandro Volta in the 1800s, is a similar concept. These discoveries paved the way for all electrical batteries. ...more on Wikipedia about "Galvanic cell"

The galvanic series determines the nobility of metals and semi-metals. When two metals are submerged in an electrolyte, while electrically connected, the less noble (base) will experience galvanic corrosion. The rate of corrosion is determined by the electrolyte and the difference in nobility. The difference can be measured as a difference in voltage potential. Galvanic reaction is the principle which batteries are based on. ...more on Wikipedia about "Galvanic series"

Grain boundary depletion is a mechanism of corrosion, when grain boundaries are depleted of some elements, changing their properties. ...more on Wikipedia about "Grain boundary depletion"

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(Hydrogen damage) > Category:Cleanup from January 2006 ...more on Wikipedia about "Hydrogen damage"

Hydrogen embrittlement is the process by which various metals, most importantly steel, become brittle and crack following exposure to hydrogen. It is not completely understood. Detection of hydrogen embrittlement in welds and fabricated parts is more difficult than detection of oxidative corrosion ( rust). ...more on Wikipedia about "Hydrogen embrittlement"

Intergranular corrosion (IGC), also termed intergranular attack (IGA), is a form of corrosion where the boundaries of crystallites of the material are more susceptible to corrosion than their insides. (Cf. transgranular corrosion.) ...more on Wikipedia about "Intergranular corrosion"

Microbial corrosion, or bacterial corrosion, is a corrosion caused or promoted by microorganisms, usually chemoautotrophs. It can apply to both metals and non-metallic materials. ...more on Wikipedia about "Microbial corrosion"

Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal. The driving power for pitting corrosion is the lack of oxygen around a small area. This area becomes anodic while the area with excess of oxygen becomes cathodic, leading to very localized galvanic corrosion. The corrosion area tends to bury into the mass of the metal, with limited diffusion of ions, further pronouncing the localized lack of oxygen. The mechanism of pitting corrosion is probably the same as crevice corrosion. ...more on Wikipedia about "Pitting corrosion"

Purple plague is a brittle, bright-purple intermetallic compound of aluminium and gold, AuAl2, formed on the contact of these two metals. The process of the growth of the intermetallic layers leads to creation of voids in the metal lattice, which leads to failures of wire bonding in microelectronics. ...more on Wikipedia about "Purple plague (intermetallic)"

Red plague is an accelerated corrosion of copper when plated with silver. After storage or use in high- humidity environment, cuprous oxide forms on the surface of the parts. The corrosion is identifiable by presence of patches of brown-red powder deposit on the exposed copper. ...more on Wikipedia about "Red plague (corrosion)"

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Rust is the substance formed when iron compounds corrode in the presence of oxygen and water. It is a mixture of iron oxides and hydroxides. Rusting is a common term for corrosion, and usually corrosion of steel. ...more on Wikipedia about "Rust"

A rusticle is a little similar to an icicle or stalactite in appearance, but occurs under water when wrought iron rusts. They may be familiar from underwater photographs of shipwrecks. ...more on Wikipedia about "Rusticle"

Selective leaching, also called dealloying, demetalification and parting, is a corrosion type in some solid solution alloys, when in suitable conditions a component of the alloys is preferentially leached from the material. The less noble metal is removed from the alloy by microscopic-scale galvanic corrosion mechanism. The most susceptible alloys are the ones containing metals with high distance between each other in the galvanic series, eg. copper and zinc in brass. ...more on Wikipedia about "Selective leaching"

Stress corrosion cracking (SCC) is the unexpected sudden failure of normally ductile metals subjected to a constant tensile stress in a corrosive environment, especially at elevated temperature. This type of corrosion often progresses rapidly. ...more on Wikipedia about "Stress corrosion cracking"

Sulphide stress cracking (SSC), or sulphide stress corrosion cracking (SSCC), is a special corrosion type, a form of stress corrosion cracking. Susceptible alloys, especially steels, react with hydrogen sulfide, forming metal sulfides and elementary hydrogen, which gets absorbed in metal and leads to hydrogen embrittlement. High content of nickel in the steels greatly improves their resistance to SSC. This type of corrosion is worst at temperatures around 80°C (176°F). ...more on Wikipedia about "Sulphide stress cracking"

White plague is the name of a gold- aluminium intermetallic compound Au5Al2 and the problems it causes in wire bonding. It has low electric conductivity, so the formation of its layer in the joint leads to increase of electrical resistance of the joint, up to total failure. ...more on Wikipedia about "White plague (intermetallic)"

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