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Traditionally, closed system treatment programs have involved adding corrosion inhibitor andperiodically testing for the residual. To be effective, these treatment programs must alsoinclude cleaning. This paper will discuss the various aspects that should be evaluated as part of a closed system treatment program.
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If the iron concentration in an alkaline chelant boiler cleaning solution reaches a high value when dissolving magnetite, it sometimes continues to increase rapidly and not level, indicating corrosion of the boiler metal. A laboratory study of “runaway iron increases” investigated the cause and the best mitigation methods.
Measuring the severity of corrosion on a specific alloy is often accomplished via mass loss using ASTM G-1. These processes work well and provide high fidelity data for many materials, especially steels. However, recent internal findings and disclosures from other research groups have highlighted a potential issue with using mass loss techniques to measure the damage on some aluminum alloy surfaces.
Inorganic zinc (IOZ) silicate coating was previously applied to partially fabricated low alloy, 21/4 Cr-1MoV, high temperature, hydrogen, reactor vessels for long-term storage corrosion protection prior to final welding and post weld heat treatment (PWHT) at 690-720°C (1274-1328°F). The need for complete coating removal to mitigate the known embrittlement and weld cracking that can occur after welding and PWHT led to the development of a novel, environmentally friendly method to remove IOZ to trace levels below 1 ppm.
Cleaning, coating, and the nondestructive testing (NDT) of corrosion-susceptible surfaces requires extensive manual labor, often at heights that can create dangerous occupational environments. Drones, also known as uncrewed/unmanned aerial vehicles or systems (UAVs, UASs), can be leveraged to perform some of these tasks, including cleaning and coating, while keeping workers safely on the ground.
In metalworking processes, contaminants can interfere with future processing steps and may accelerate corrosion on metal parts. As such, a cleaning step is often implemented prior to coating or packaging finished parts. Industrial cleaners are typically water-based with blends of surfactants, co-solvents, chelating agents, and/or flash rust inhibitors. While accelerated corrosion tests such as humidity and salt fog exist, they are typically too aggressive for the evaluation of flash rust inhibitors in cleaners which are not meant to provide long-term corrosion protection. There is a need in the industry for a quick and reliable way to select a cleaner that meets the needs of the application and is compatible with the overall process. A screening method to compare the flash rust protection ability of various water-based cleaners was investigated. Modified vapor inhibiting ability (VIA) testing and linear polarization resistance (LPR) tests were performed on carbon steel plugs treated with several cleaners. Industry standards currently recommend that any detergent or cleaner be removed from metal surfaces prior to applying coatings. When evaluating cleaning processes where coatings will be subsequently applied, adhesion testing should be paired with the screening test. The effects of various cleaners on adhesion of a waterborne acrylic coating were investigated.
The primary scope of this paper is to outline guidelines for cleaning, repairing, and restoring / renovating Exterior Insulation and Finish Systems (EIFS) and non-EIFS exteriors.
Esta norma conjunta abrange o uso de abrasivos para jateamento com o objetivo de atingir um grau definido de limpeza de superfícies de aço antes da aplicação de um revestimento protetor ou um sistema de revestimento. Esta norma destina-se ao uso por especificadores, aplicadores, inspetores de cobertura ou revestimento ou outros que venham a ser responsáveis por definir um grau padrão de limpeza de superfície.
O foco desta norma é o jateamento abrasivo brush-off. O jateamento abrasivo ao metal branco, o jateamento abrasivo ao metal quase branco, o jateamento abrasivo comercial e o jateamento abrasivo industrial são abordados em normas separadas.
Requirements for "White Metal" - one of five levels of cleanliness of steel surfaces achieved by blast cleaning with the use of abrasives. (White Metal, Near-White Metal, Commercial, Industrial, Brush Off)