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2013-01-01T05:33:20Z

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All metals and certain polymers and ceramics are inclined to corrosion, that is typically developed by the presence of moisture in the air or direct connection with water. In metals this method is oxidation: the alteration of electrostatic charge whereby salts or oxides are created, resulting in damage to the metal's structure. Rusting, the production of red oxide in an iron structure, is a very common example of this. The phrase 'degradation' is applied to the corrosion of non-metals, however the process is identical: the corroding material surrenders electrons in a chemical reaction and loses its structural integrity. Corrosion testing can be applied for the following sorts of damage.

Galvanic corrosion happens when two metals enter into contact inside an electrolytic medium or one metal is exposed to two different electrolytes. Microbiologically Influenced Corrosion is as a result of micro-organisms attacking a metallic or non-metallic material either with or without the presence of oxygen; for example Accelerated Low Water Corrosion damages steel piles round the low-water mark, leaving behind an orange sludge for a deposit. Aerospace materials, engines or power-generation materials are typical cases of substances susceptible to High Temperature Corrosion. Metal Dusting happens in high-carbon-dioxide contexts, creating a tell-tale film of graphite on metal and reducing the metal to powder.

Corrosion testing necessitates the promotion of deterioration in test samples to find out the extent and rate of any damage by corrosion within the environment. Accelerated Corrosion Testing is a strategy created to calibrate the long-term effects on a system of alternating wet and dry cycles, inducing the output of partially dry corrosion agents that exacerbate degradation within the system. Typical is the ISO 11474 test, which employs an outdoor intermittent salt water spray.

Weld testing for corrosion damage or any other structural compromise can be carried out via Dye Penetrant Inspection. Penetrant is used to a test surface and left for 5-30 minutes. Developer, such as dry powder or Non-Aqueous Wet Developer (e.g. acetone), draws penetrant from defects in a visible ‘bleed-out’ process. Other weld testing methods consist of Magnetic Particle Testing, X-rays, 3D X-rays and microscopy: all categorised as Non-Destructive Inspection procedures. [http://www.dailystrength.org/people/2388173/journal/5193502 the link]

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