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23.01.2022 Defects in a coating film. Takeaway: Defects in a coating film, however small, can ultimately leave the metal substrate vulnerable to corrosion, thus negating the purpose of the protective coating. ...Continue reading

18.01.2022 The 5 Key Considerations to Prevent Corrosion Corrosion can have devastating effects on the integrity of structures and components. Corrosion, if not accounted for, can leave even the best designs useless by compromising the mechanical and chemical properties of many different materials. With proper consideration, however, corrosion can be limited and even prevented almost entirely. There are many different ways that the risk of corrosion can be reduced. This article highligh...Continue reading

11.01.2022 Why Do Two Dissimilar Metals Cause Corrosion? Referring to an article in the Corrosionpedia by Krystal Nanan. Takeaway: The difference in electrode potential between dissimilar metals is the main contributing factor to bimetallic corrosion. This electrochemical process, depending on the application, can be both detrimental and beneficial....Continue reading

08.01.2022 Why Understanding the Stress Concentration Factor (Kt) is Important When Evaluating Corrosion in Metal Structures Takeaway: Corrosion damage, such as pitting, results in the magnification of local stresses around cracks and cavities due to stress concentration. This directly affects the stress concentration factor (Kt), which is a useful indicator of the integrity of the structure under applied loading. Corrosion formed on the surface of a metal has the potential to alter its...Continue reading

06.01.2022 People ask me allot way Stainless steel is known for its corrosion resistance in many environments in which carbon and low-alloy tool steels would corrode. Here is an article that would explain it very well.(Background reading: An Introduction to Stainless Steels.) The corrosion resistance is a result of a very thin (about 5 nanometers) oxide layer on the steel’s surface. This oxide layer is referred to as a passive layer since it renders the surface electrochemically passive... in the presence of corrosive environments. The passive layer forms because of the chromium added to stainless steel. Stainless steel must have at least 10.5% chromium in order for the passive layer to form. The more chromium that is added, the more stable the passive layer becomes, and the better the corrosion resistance. (For more on chromium, see The Role of Chromium in Intergranular Corrosion.) Other elements such as nickel, manganese and molybdenum can be added to enhance stainless steel corrosion resistance. Another requirement for the formation and maintenance of the passive layer is that the steel surface must be exposed to oxygen. Corrosion resistance is greatest when the steel is boldly exposed and the surface is maintained free of deposits. If passivity is destroyed under conditions that do not permit restoration of the passive film, then stainless steel will corrode much like a carbon or low-alloy steel. For example, covering a portion of the surfacefor example, by biofouling, painting or installing a gasketproduces an oxygen-depleted region under the covered region. The oxygen-depleted region is anodic relative to the well-aerated boldly exposed surface, possibly resulting in the corrosion of the covered region. Under certain circumstances, the passive layer can break down at localized spots on a well-exposed stainless steel surface. When this happens, the metal can corrode in the localized spots. This is called pitting corrosion. One common cause of pitting corrosion is exposure to aqueous environments that contain chloride. Examples are coastal atmospheres, road salt combined with rainwater, and even tap water containing high levels of chloride. During the fabrication of stainless steel components or structures, it is possible to degrade the corrosion resistance. This occurs when austenitic stainless steels (e.g., 304 grade) are exposed to temperatures between about 797F (425C) and 1598F (870C). If the exposure time is too long, then the areas near the metal’s grain boundaries lose their corrosion resistance and can be preferentially attacked when exposed to a corrosive environment. The grains fall out and the metal loses strength. The increased susceptibility to corrosion by this change in microstructure is called sensitization. *** The article and images previously appeared at https://www.imetllc.com//stainless-steel-corrosion-resista. Reprinted with permission. Copyright Industrial Metallurgists, LLC.

02.01.2022 Original-Owner 1967 GT 390 Fastback Dug Out of the Dirt https://www.msn.com//original-owner-1967-gt-390/ar-BBLwlkV