Corrosion Resistance

Corrosion Resistance


the capacity of a metal or alloy to resist the corrosive action of a medium. It is determined by the rate of corrosion under given conditions.

The rate of corrosion is characterized by qualitative and quantitative indexes. Among the qualitative indexes are changes in the surface appearance and microstructure of a metal. Quantitative indexes include the time required for the appearance of the first corrosion site or the number of corrosion sites appearing over a given time period, the reduction in thickness of the metal per unit time, change in the weight of the metal per unit area and time, the volume of gas released (hydrogen) or absorbed (oxygen) in the course of corrosion per unit area and unit time, the current density corresponding to the rate of the given corrosion process, and the percentage change in any mechanical property, electric resistance, and reflectivity of the metal over a given period. A number of scales have been proposed for evaluating the corrosion resistance of metals. The most widely used and recom-mended is the ten-point scale.


References in periodicals archive ?
The main advantage of DTM coatings is that they simplify a complex coating process by reducing the number of coating layers needed on metal substrates, and thus, help save time and money, all the while guaranteeing good corrosion resistance.
If a combination of outdoor durability and anticorrosion performance is needed, other technologies such as 2K or lK acrylics and alkyds are better suited, although a lower level of corrosion resistance is usually achieved.
Corrosion Resistance shown by the investigated coating is due to Cr2O3 phase formed on coating thus the results are favorable for boiler applications.
To choose the substrate with great corrosion resistance and great cladding material weight is very important in the perishable environment.
The Company holds Wide range of Grades of Stainless Steel, which provides great excellent corrosion resistance.
Formed in 2007, as a spin off from The Danfoss Group, Tantaline A/S established itself in the commercialisation of tantalum treated parts for corrosion resistance.
The latest film-build technology developed by Dow offers formulators the ability to formulate direct-to-metal coatings with good adhesion for various substrates, and fast early hardness to enable high application line speeds with good corrosion resistance.
An investigation of the mechanism of this corrosion resistance leads to the following observations: 1) Even in an area where the paint coating is missing, Si[O.
At present, in order to improve the performance of magnesium alloy to use time became long, applications try to expand the scope, has many techniques are applied to the magnesium alloy surface treatment, the main treatment methods commonly used in a chemical oxidation, metal coating, anodic oxidation, organic coating, micro arc oxidation, some methods can be matched with organic coating, through treatment, relatively dense protective film formed on the surface of magnesium alloy, or coating so as to improve the corrosion resistance of magnesium alloy.
Zinc-rich electrocoat technology sets new corrosion resistance standard.
Tech-Etch's MP35N is an ultra-high tensile strength metal with good ductility and excellent corrosion resistance used for medical implants.
For improvement of corrosion resistance properties, the vast majority of industries around the world continue to use the most widely known method of passivation treatment with chemicals containing hexavalent chrome.

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