Aluminum alloys are widely used in engineering structures and components due to their light weight and excellent mechanical properties. However, the alloying elements which contribute to the good mechanical properties also make the alloy prone to localized corrosion. One of the most common and economic approaches to protect Al alloys from corrosion is to apply coatings as protective layers. For example, powder coatings and magnesium-rich primers (MgRP) are both widely used for the corrosion protection of Al alloys.
This paper on the use of Fourier transform infrared spectroscopy and instrumental determination using algorithm-based comparison of spectra is comprised of an orientation to the basics of instrument use and sample preparation, followed by a review of test programs and results of instrument-based spectra comparisons of numerous industrial coating types. The chemical molecular bonds associated with each coating type used to generically identify the coating types will be reviewed as background information.
By establishing a holistic program that incorporates workforce training, the nation's first baccalaureate degree in Corrosion Engineering, and world-class research in corrosion and materials performance; The University of Akron (UA) is establishing a program that will create a pipeline of critical resources that will ensure that future investments in equipment and infrastructure revitalization are designed and implemented in a manner that minimizes the impact of corrosion and thus reduces the life-cycle cost to sustain those assets.
The paint and coatings industry has witnessed significant change over the past 50 years. These changes have been driven by many factors including VOC mandates, safety concerns, advanced polymers and new demands of the end users and materials. One of those changes was the introduction of desiccant dehumidification to assist in the blast and coatings process of liquid storage tanks in 1983. The ability to indefinitely hold a blast by providing a dry climate mechanically set off the beginning of a technology that would continue to advance for years to come.
Existing US Navy Coefficient of Friction (CoF) meters are insensitive and cannot differentiate surfaces which have obvious differences in nonskid CoF. A new CoF meter, the m-Deck, was evaluated to determine CoF measurement effectiveness and temperature sensitivity. Both laboratory and field testing were performed over various nonskid systems at numerous temperatures. The results indicate that the m-Deck has significant temperature dependence, but also a high degree of accuracy. The collected data is used to establish acceptance criteria for newly installed nonskid.
During the testing of circular grit chambers in a wastewater treatment plant under construction, serious leaking problems were discovered prior to project completion. After meetings with the Owner, Design and Construction engineering firms, painting contractor and coatings manufacturer, the decision was made to apply 80 mils of pure polyurea to various concrete surfaces. This presentation, through the use of photo images taken during remediation, describes the nature of the problem and how it was solved.
Epoxy linings have long been the standard generic resin type when specifiers are selecting products for lining new steel potable water tanks or rehabilitating existing steel potable water storage tanks in North America. The one exception to this rule has been the Canadian potable water storage market. In Canada many specifiers have recognized the benefits offered by 100% Solids Elastomeric Polyurethane linings for 25+ years with admirable results.
This presentation may contain forward-looking statements based on current assumptions and forecasts made by Covestro. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here.
Highly engineered PVDF (polyvinylidene fluoride) based coatings have evolved over the years to meet the specific requirements of market segments. Over 50 years ago, high temperature-baked PVDF based finishes were introduced to the architectural community to protect the metal components of skyscrapers, stadiums, and other landmark structures. The multi-decade service life and extreme weatherability of these coatings is attested to by outdoor Florida exposure and demonstrated by performance on structures worldwide.
This paper will present the results of an inspection conducted in 2007, nominally 20 years after the initial coating application. The inspection showed varied service lives associated with the different coating systems. Some of the systems were in excellent condition after 20 years while others had completely broken down.