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Wikipedia About Corrosion

for: corrosive

Corrosion means the disintegration of a material into its constituent atoms due to chemical reactions with its surroundings. In the most common use of the word, this means a loss of electrons of metals reacting with water and oxygen. Weakening of iron due to oxidation of the iron atoms is a well-known example of electrochemical corrosion]]. This is commonly known as rusting. This type of damage typically produces oxide(s) and/or salt(s) of the original metal. Corrosion can also refer to other materials than metals, such as ceramics or polymers. Although in this context, the term degradation is more common.

Most structural alloys corrode merely from exposure to moisture in the [[air, but the process can be strongly affected by exposure to certain substances (see below). Corrosion can be concentrated locally to form a pit or crack, or it can extend across a wide area to produce general deterioration. While some efforts to reduce corrosion merely redirect the damage into less visible, less predictable forms, controlled corrosion treatments such as passivation and chromate-conversion will increase a material's corrosion resistance.

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Galvanic corrosion

main: Galvanic corrosion Galvanic corrosion occurs when two different metals electrically contact each other and are immersed in an electrolyte. In order for galvanic corrosion to occur, an electrically conductive path and an ionically conductive path are necessary. This effects a galvanic couple where the more active metal corrodes at an accelerated rate and the more noble metal corrodes at a retarded rate. When immersed, neither metal would normally corrode as quickly without the electrically conductive connection (usually via a wire or direct contact). Galvanic corrosion is often utilised in sacrificial anodes. What type of metal(s) to use is readily determined by following the galvanic series. For example, zinc is often used as a sacrificial anode for steel structures, such as pipelines or docked naval ships. Galvanic corrosion is of major interest to the marine industry and also anywhere water can contact pipes or metal structures.

Factors such as relative size of anode (smaller is generally less desirable), types of metal, and operating conditions (temperature, humidity, salinity, etc.) will affect galvanic corrosion. The surface area ratio of the anode and cathode will directly affect the corrosion rates of the materials.

Galvanic series

main: Galvanic series In a given sea environment (one standard medium is aerated, room-temperature seawater), one metal will be either more noble or more active than the next, based on how strongly its ions are bound to the surface. Two metals in electrical contact share the same electron gas, so that the tug-of-war at each surface is translated into a competition for free electrons between the two materials. The noble metal will tend to take electrons from the active one, while the electrolyte hosts a flow of ions in the same direction. The resulting mass flow or electrical current can be measured to establish a hierarchy of materials in the medium of interest. This hierarchy is called a galvanic series, and can be a very useful in predicting and understanding corrosion.

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News about Corrosion

Crown Valley sinkhole and damage repairs to start Thursday

Orange County RegisterDelays are expected even though one or two lanes of the Laguna Niguel street will remain open during construction.http://www.ocregister.com/articles/water-lanes-valley-240583...

NASA: damage to shuttle Atlantis' heat tiles is not a concern 'today'

Orlando SentinelIt was the kind of incident that can make a space shuttle engineer’s heart stop: an unknown piece of debris on launch Monday skipped across some heat protection tiles on the forward most part of space shuttle Atlantis’ right wing, leaving 21 inch long gouge marks.http://www.orlandosentinel.com/orl-sl-shuttle-tile-damage-05...

Broken water main affects traffic, service

The Star PressMUNCIE -- A water main break at busy Wheeling and Centennial avenues Tuesday afternoon backed up traffic and caused temporary water shutoffs to about 50 customers.http://www.thestarpress.com/article/20090513/NEWS01/90513033...

New alloy to save Indian rails from toilet corrosion

Calcutta NewsA new alloy steel developed at the Indian Institute of Technology in Kanpur (IIT-K) has provided the answer to one of the major problems faced by the Indian railway system - corrosion of rails by toilet discharge.http://www.calcuttanews.net/story/499042

Nebraska: Almost $4M For Meridian Conversion

Yankton Press & DakotanAn official with the Nebraska Department of Roads confirmed Tuesday that the agency has allotted almost $4 million in federal stimulus funds to the renovation of the Meridian Bridge.http://www.yankton.net/articles/2009/05/13/community/doc4a0a...

News about Corrosion

Northern Technologies International Corporation Announces Filing of ...

MSN MoneyCentralNTIC manufactures, markets and sells primarily rust and corrosion inhibiting products and services for automotive, electronics, electrical, mechanical and military applications, sold under the brand names Zerust(r) and EXCOR(r). NTIC also offers ... http://news.moneycentral.msn.com/provider/providerarticle.as...

Audi Selects Alcoa Wheel's Dura-Bright(R) Technology for New A6

MSN MoneyCentralIt resists peeling, cracking and corrosion while offering a premium finish in keeping with Audi ’ s vehicle design philosophy. Alcoa ’ s proprietary Dura-Bright ® technology surface treatment has been offered in the commercial ... http://news.moneycentral.msn.com/provider/providerarticle.as...

Blast probe blames Apache

News.com.auPOOR monitoring that didn't pick up inneffective anti-corrosion treatment of a pipeline was behind the blast that triggered WA's gas crisis in June, a probe has found. The report by the National Offshore Petroleum Safety Authority indicated that the ... http://www.news.com.au/perthnow/story/0,21598,24475314-948,0...

Pork Alert: 2009 Military Construction

Forbes27 million by Senate Appropriations Committee Chairman Robert Byrd (D-W.Va.) for a fuel system/corrosion control hangar at Yeager Airport. -- $18.4 million by House Military Construction/Veterans Affairs Appropriations ... http://www.forbes.com/businesswire/feeds/businesswire/2008/1...

UPDATE 1-U.S. allows Cove Point LNG expansion to continue

ReutersBut FERC concluded, when it approved the project in 2006, that the leaks in the coupling seals that connected the pipes were mainly due to hot tar the company applied to seals when the pipes were installed as a means of corrosion control. FERC ... http://www.reuters.com/article/marketsNews/idUSN074541002008...

Search results for Corrosion

Australasian Corrosion Association

Australasian Corrosion Association. A membership based, not-for-profit, industry association, the Australasian Corrosion Association Incorporated (ACA) was established in 1955 to ... http://www.corrosion.com.au/

Corrosion Jobs

A complete source for jobs in the corrosion industry.http://www.corrosionjobs.com/

Corrosion Protection Management

Cathodic Protection Management Corrosion Specialists ... CPM offers complete ECDA Services: At CPM we specialize in corrosion control for metallic structures which are ... http://corrosionspecialists.com/

corrosion: Definition from Answers.com

corrosion n. The act or process of corroding. The condition produced by corroding. A substance, such as rust, formed by corrodinghttp://www.answers.com/topic/corrosion

corrosion definition |Dictionary.com

Sponsored Links Rust in Water? Corrosion in pipe lines or machines? Secure and lasting Solution, no Chemicals www.merusonline.comhttp://dictionary.reference.com/search?q=corrosion
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Corrosion of Conformity - Albatross...

Corrosion of Conformity - Albatross (full)The video to the Corrosion of Conformity song "Albatross". From the album DeliveranceFlash - Video

Qantas denies 'corrosion' report

Qantas denies 'corrosion' reportQantas has denied a Boeing 747 had problems with corrosion before a giant hole appeared in the fuselage at 29,000 feet.Terrified passengers on the London to Melbourne flight had...Flash - Video

How To Clean Corrosion Off Car Batt...

How To Clean Corrosion Off Car Battery VideoPop can clean anything! Submitted by: themeatloaf Vouched by: 1 Tags: Car , Battery , Clean , Pop , Soda , Coke , Pepsi , Howto , How Added:01-Aug-2007Video - Video

Corrosion Of Conformity - Clean My ...

Corrosion Of Conformity - Clean My WoundsCorrosion Of Conformity Clean My Wounds (C) 1994 SONY BMG MUSIC ENTERTAINMENTFlash - Video

MONSTER BEHIND THE WHEEL: McCarty a...

MONSTER BEHIND THE WHEEL: McCarty and McLaughlin Novel from Corrosion Press/Delirium BooksMONSTER BEHIND THE WHEEL, a novel by Michael McCarty and Bram Stoker Award-winning writer Mark McLaughlin, will be published by Corrosion Press, a division of Delirium Books,...Flash - Video

Answers for Corrosion

ammara711Corrosion ...........?!?ammara711For the 5th generation US air superority and multi-role aircraft (F/A-35 and F/A-22), most of the aircraft's exterior has radar absorbing composites as its skin, not metal. While using this material ...illuminati229@sbcglobal.netHow can i remove the corrosion in the memory card slot on my samsung blast?illuminati229@sbcglobal.netAcetate!!!CassieAWhat is stray current corrosion, and how do you prevent it?CassieAStay current is always present as long as the battery is connected, the current is passing through the entire metal structure of the engine and running gear. Formally know as electrolysis. Zinc anodes...mrbadmoodIn airplane maintenance, what does the term corrosion mean?mrbadmoodYes, the forming of a white powder is one indication of aluminum corrosion. (Others would be pitting, flaking, or wearing away, but that's not germane to your question.) Light corrosion damage is acce...Midas and The MuseHow can I stop corrosion from Glycolic Acid on my marble counter?Midas and The Musetry using an alkali to neutralize the acid(soda crystals) use a very dilute solution at first on a small piece to see if there is an adverse reaction. some of the acid must still be present even tho...
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