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From Geofic
All metals and certain polymers and ceramics are susceptible to corrosion, which is typically developed by the existence of moisture in the air or direct exposure to water. In metals this procedure is oxidation: the alteration of electrostatic charge whereby oxides or salts are made, causing damage to the metal's structure. Rusting, the creation of red oxide in an iron structure, is a very common demonstration of this. The phrase 'degradation' is applied to the corrosion of non-metals, however the process is similar: the corroding material surrenders electrons in a chemical reaction and loses its structural integrity. Corrosion testing does apply for the following kinds of damage.
Galvanic corrosion takes place when two metals enter into contact inside an electrolytic medium or one metal is subjected to two different electrolytes. Microbiologically Influenced Corrosion is brought on by micro-organisms assaulting a metallic or non-metallic material either without or with the presence of oxygen; for instance Accelerated Low Water Corrosion damages steel piles around the low-water mark, leaving an orange sludge as a deposit. Aerospace materials, engines or power-generation materials are typical cases of substances prone to High Temperature Corrosion. Metal Dusting takes place in high-carbon-dioxide contexts, creating a tell-tale film of graphite on metal and reducing that metal to powder.
Corrosion testing necessitates the promotion of degradation in test samples to determine the rate and extent of any damage by corrosion within the environment. Accelerated Corrosion Testing is a strategy intended 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 in the system. Typical is 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. Various other weld testing methods include Magnetic Particle Testing, X-rays, 3D X-rays and microscopy: all classified as Non-Destructive Inspection approaches. All metals and certain ceramics and polymers are susceptible to corrosion, that is typically developed by the presence of moisture in the air or direct connection with water. In metals this process is oxidation: the alteration of electrostatic charge where salts or oxides are produced, causing damage to the structure of the metal. Rusting, the production of red oxide within an iron structure, is a very common example of this. The term '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 does apply for the following types of damage.
Galvanic corrosion occurs when two metals enter into contact inside an electrolytic medium or one metal is exposed to two different electrolytes. Microbiologically Influenced Corrosion is caused by micro-organisms attacking a metallic or non-metallic material either with or without the existence of oxygen; by way of example Accelerated Low Water Corrosion damages steel piles around the low-water mark, leaving behind an orange sludge as a deposit. Aerospace materials, engines or power-generation materials are normal instances of substances vulnerable to 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 degradation in test samples to establish the rate and extent of any damage by corrosion in the environment. Accelerated Corrosion Testing is a strategy designed to calibrate the long-term effects on a system of alternating wet and dry cycles, creating the production of partially dry corrosion agents that aggravate degradation in the system. Typical is the ISO 11474 test, which employs an outside 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.
