Archive for the ‘Corrosion Behaviour’ Category
Friday, March 24th, 2006
Weld Backing Aids
The use of some form of back-up to maintain and shape in position molten aluminum on full fusion butt joints welded from one side only are numerous and take many forms.Temporary Backing Bars. These are made of mild steel, stainless steel, or copper, and are placed under the ...
Posted in Aluminium, Aluminum Alloys, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
In the chemical, cryogenic, aerospace, and nuclear industries, aluminum and its alloys are widely used and frequently need to be joined by the application of welding. To fulfill this demand, the gas-shielded TIG and MIG processes, which are capable of producing high integrity welded joints, are used almost exclusively.
However, before ...
Posted in Aluminium, Aluminum Alloys, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
Atmospheric Corrosion. The behavior of zinc and zinc coatings during atmospheric exposure has been closely examined in tests conducted throughout the world. The performance of zinc in a specific atmospheric environment can be predicted within reasonable limits.
Precise comparison of corrosion behavior in atmospheres is complex because of the many factors ...
Posted in Zinc, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
The corrosion resistance of magnesium or magnesium parts depends on similar factors that are critical to other metals. However, because of the electrochemical activity of magnesium, the relative importance of some factors is greatly amplified.
This article will discuss the effects of heavy-metal impurities, the type of environment (rural atmosphere, marine ...
Posted in Magnesium, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
Nickel and nickel-base alloys are vitally important to modern industry because of their ability to withstand a wide variety of severe operating conditions involving corrosive environments, high temperatures, high stresses, and combinations of these factors.
There are several reasons for these capabilities. Pure nickel is ductile and tough because it possesses ...
Posted in Nickel Alloys, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
COPPER AND COPPER ALLOYS are widely used in many environments and applications because of their excellent corrosion resistance, which is coupled with combinations of other desirable properties, such as superior electrical and thermal conductivity, ease of fabricating and joining, wide range of attainable mechanical properties, and resistance to biofouling.
Copper corrodes ...
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Friday, March 24th, 2006
Aluminum alloys that contain appreciable amounts of soluble alloying elements, primarily copper, magnesium, silicon, and zinc, are susceptible to stress-corrosion cracking (SCC).
An extensive failure analysis shows how many service failures occurred in the industry and what kind of alloys and stresses led to initiation and propagation of stress corrosion cracks ...
Posted in Aluminum Alloys, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
Titanium alloys were originally developed in the early 1950s for aerospace applications, in which their high strength-to-density ratios were especially attractive. Although titanium alloys are still vital to the aerospace industry for these properties, recognition of the excellent resistance of titanium to many highly corrosive environments, particularly oxidizing and chloride-containing ...
Posted in Titanium, Corrosion Behaviour | No Comments »
Friday, March 24th, 2006
Aluminum owes its excellent corrosion resistance and its usage as one of the primary metals of commerce to the barrier oxide film that is bonded strongly to its surface and, that if damaged, re-forms immediately in most environments.
On a surface freshly abraded and then exposed to air, the barrier oxide ...
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Friday, March 24th, 2006
The cost of corrosion to US industries and the American public is currently estimated at $170 billion per year. Although corrosion is only nature`s method of recycling, or of returning a metal to its lowest energy form, it is an insidious enemy that destroys our cars, our plumbing, our buildings, ...
Posted in Metal, Corrosion Behaviour | No Comments »