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Corrosion Behavior

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Atmospheric Corrosion of Aluminum Alloys

Relative humidity, temperature, sunshine, pollutants, salinity all play a significant role in the atmospheric corrosion rate of materials and when very specific conditions are taken into consideration e.g. subtropical marine environments, can result in some of the most extreme corrosion conditions possible.
As one of the most widely produced metals on the planet, aluminum is the subject of many investigations in this area with at times, some interesting results.

Atmospheric Corrosion Resistant CORTEN Steel

Weathering means that due to their chemical composition steels exhibit increased resistance to atmospheric corrosion compared to unalloyed steels. The corrosion retarding effect of the protective layer is produced by the nature of its structure components and the particular distribution and concentration of alloying elements in it.

Cast Stainless Steels

Cast stainless steels are chromium-containing alloys primarily classified as either corrosion-resistant or heat-resistant castings based on carbon content. These materials provide superior corrosion resistance in aqueous environments and excellent service performance at elevated temperatures due to chromium additions exceeding 11%.

Cavitation Erosion

Cavitation Erosion is a localized form of erosion caused by repeated small or large impact pressures which lead to pitting, initially on a granular level.
Testing of resistance to cavitation erosion is a well-documented subject with the main measurement indicators being the change of cumulative erosion rate (The amount of mass losing in unit time) with time.

Corrosion and Corrosion Properties of Stainless Steels: Part One

Stainless steels owe their corrosion resistance to a spontaneous, thin oxide film that forms on their surfaces, significantly reducing corrosion rates. Chromium is the key alloying element responsible for this passive film, typically requiring about 17% chromium for effective protection. Other elements like molybdenum, nickel, and nitrogen enhance corrosion resistance in specific environments.

Corrosion and Corrosion Properties of Stainless Steels: Part Three

Intergranular corrosion, also called intercrystalline corrosion, occurs on or adjacent to the grain boundaries of a metal. It is caused by microsegregation of impurities and alloying elements on the grain boundaries.
The driving force of intergranular corrosion is the difference between the electrode potentials of the grain boundary and the grain itself, which form a galvanic cell in presence of an electrolyte.