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The nut and bolt thread protector system is a patented, ultraviolet stabilized polyethylene thread protector, which seals nut and bolt threads in pressurized grease to effectively prevent corrosion and provide protection against physical damage.
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The need for corrosion mitigation and repair is a perennial concern for a wide array of industries. An attractive evolution in coatings application for mitigating the effects of environmental/operational degradation is cold spray of metallic replacement layers. As cold spray technologies continue to become more commonplace, portable, low-pressure cold spray systems presents an opportunity to bring metallic repair to the field for heavily damaged or corroded assets.
Aerospace assets are subjected to routine maintenance cycles to prevent, monitor, and repair corrosion damage. Currently, the maintenance cycles are determined according to its model and following its respective requirements document (eg: NA(1) 01-1A-5091 or USAF(2) Technical Order 1-1-691).2 A new paradigm of condition-based maintenance (CBM) is highly desired, as a given asset will require different prevention, monitoring, and repair maintenance cycles depending on where it is deployed. As corrosion is the degradation of a material in response to its environment, CBM takes into consideration the variability of the environment (the conditions to which an asset is exposed) when determining appropriate maintenance intervals and what should be done at each interval.
The exposure environment of an engineering material quite often has a large impact on how that material behaves over time. Environments are distinguished by differences in meteorological patterns, geography, salinity, Ultraviolet (UV) radiation, etc1-3. Thus, the degradation of various materials scales proportionately to the characteristics of the exposure site, with more severe sites leading to worse degradation. Developing an understanding of how the local environment impacts the corrosion rates of metals and the deterioration of anti-corrosion coatings is critical for informing asset maintenance schedules and lifetime predictions4.
5XXX-series aluminum has been used in multiple naval vessels because it offers excellent strength to weight ratios, weldability and low cost. Although 5XXX series aluminum alloys generally provide excellent corrosion resistance, exposure to moderately elevated temperatures (e.g., solar exposure) results in sensitization due to precipitation of the beta phase (Mg2Al3) at the grain boundaries. The sensitization of marine grade aluminum and subsequent material degradation due to stress corrosion cracking (SCC) and intergranular corrosion (IGC) is a severe problem, causing expensive repairs and out of service time.
This paper investigates a key concern with Ultra High Pressure Waterjetting (UHPWJ) surface preparation – the impact of “flash rusting” on coating life. Flash rusting can occur under certain environmental conditions when the steel is left sufficiently wet following UHPWJ. Reducing or eliminating flash rusting can increase the cost of surface preparation. However, flash rust’s impact on coating life is debated.
Fighter Squadron Composite One One One (VFC-111) is a US Navy adversary squadron based out ofNaval Air Station (NAS) Key West, Florida. VFC-111 operates F-5 Tiger-II tactical fighter jets as part of their dissimilar air combat training program provided to fighter squadrons within the Navy, Marine Corps, Air Force, Air Force Reserve, and Air National Guard.
This paper will present two case studies of pre-mature failure of process equipment in seawater service which will illustrate the influence of metallurgical structure on the service performance of Nickel-Aluminum Bronze in marine environments.
TSA is mainly used to protect offshore steel structures, including atmospheric, splash and immersed zones. During installation or in service, the coating is likely to be damaged due to erosion, wear, scratch etc. TSA coatings protect by acting as a barrier and offering cathodic protection even if the substrate is exposed to seawater.