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All metals and certain polymers and ceramics are susceptible to corrosion, which is typically created by the existence of moisture in the air or direct contact with water. In metals this procedure is oxidation: the alteration of electrostatic charge whereby salts or oxides are created, creating damage to the structure of the metal. Rusting, the creation of red oxide in an iron structure, is a very common illustration of this. The phrase 'degradation' is applied to the corrosion of non-metals, though the process is similar: the corroding material surrenders electrons in a chemical reaction and loses its structural integrity. Corrosion testing can be applied for the following types of damage.
Galvanic corrosion takes place when two metals come into contact within the electrolytic medium or one metal is confronted with two different electrolytes. Microbiologically Influenced Corrosion is the result of micro-organisms attacking a metallic or non-metallic material either without or with the presence of oxygen; as an 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 common cases of substances at risk from High Temperature Corrosion. Metal Dusting takes place in high-carbon-dioxide contexts, developing a tell-tale film of graphite on metal and reducing the metal to powder.
Corrosion testing requires the promotion of deterioration in test samples to determine the rate and extent of any damage by corrosion in the environment. Accelerated Corrosion Testing is a method intended to calibrate the long-term effects on the system of alternating wet and dry cycles, creating the production of partially dry corrosion agents that exacerbate degradation within the system. Typical could be the ISO 11474 test, which employs an outside intermittent salt water spray.
Weld testing for corrosion damage or 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. Different weld testing methods involve Magnetic Particle Testing, X-rays, 3D X-rays and microscopy: all categorised as Non-Destructive Inspection procedures. All metals and certain ceramics and polymers are susceptible to corrosion, that is typically created by the presence of moisture in the air or direct exposure to water. In metals this technique is oxidation: the alteration of electrostatic charge where oxides or salts are made, resulting in damage to the metal's structure. Rusting, the creation of red oxide within an iron structure, is a common demonstration of this. The term 'degradation' is applied to the corrosion of non-metals, though the process is the same: the corroding material surrenders electrons in a chemical reaction and drops its structural integrity. Corrosion testing can be applied for the following kinds of damage.
Galvanic corrosion occurs when two metals enter into contact within the electrolytic medium or one metal is confronted with two different electrolytes. Microbiologically Influenced Corrosion is the result of micro-organisms attacking a metallic or non-metallic material either without or with the existence of oxygen; as an example Accelerated Low Water Corrosion damages steel piles around the low-water mark, leaving behind an orange sludge for a deposit. Aerospace materials, engines or power-generation materials are common instances of substances at risk from High Temperature Corrosion. Metal Dusting occurs in high-carbon-dioxide contexts, developing a tell-tale film of graphite on metal and reducing that metal to powder.
Corrosion testing requires the promotion of deterioration in test samples to ascertain the rate and extent of any damage by corrosion within the environment. Accelerated Corrosion Testing is a method designed to calibrate the long-term effects on the system of alternating wet and dry cycles, inducing the output of partially dry corrosion agents that worsen degradation in the system. Typical could be the ISO 11474 test, which employs an outdoor intermittent salt water spray.
Weld testing for corrosion damage or other structural compromise can be done via Dye Penetrant Inspection. Penetrant is applied to a test surface and left for 5-30 minutes. Developer, either dry powder or Non-Aqueous Wet Developer (e.g. acetone), draws penetrant from defects in a visible ‘bleed-out’ process. Some other weld testing methods include Magnetic Particle Testing, X-rays, 3D X-rays and microscopy: all considered as Non-Destructive Inspection methods.
