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The performance of a Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application. Assessment of possible coating degradation and corrosion development was made by physical and electrochemical techniques. Passive-like conditions developed in the chloride-free solutions and formation of oxide product occurred in the chloride solutions. A large degree of oxide product formation throughout the non-scribed coating exposure surface area, consistent with the large, measured corrosion current, was indicative that the ceramic coating had poor barrier coating properties.
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The mechanical properties of polymeric coatings are often overlooked because researchers are not aware of how modern instrumentation can now aid them in understanding how a particular product may survive in service conditions. In many applications the two main considerations are aesthetics and durability, both of which can be directly related to the mechanical properties of the base material.
Moisture problems are prevalent all over North America, almost independent of climate. With an understanding of moisture in concrete and the various test methods available to quantify that moisture, simple strategies to mitigate moisture problems can be employed. But a strategy cannot be employed if the moisture problem is never quantified. This presentation identifies the various types of moisture issues present day in and day out and outlines the methods available to discover hidden moisture conditions.
The most commonly accepted way to protect structural steel on bridges is with liquid applied coatings (paint). The current life expectancy for field-applied protective coatings (maintenance painting) is about 20 years in snow/ice and marine areas. Most bridge owners use a remove-and replace strategy for maintenance painting, with unit costs usually in excess of $10.00 per ft. The cost of maintaining a protective coating during the service life of a bridge may approach the bridge’s original construction costs.
An in-depth look at alternative “green” methods of surface preparation when traditional abrasive blasting of exterior steel substrates is either impractical, costly, or there is an inherent desire to minimize environmental impact, dust generation, and contaminant release, such as solvents or lead.
This paper deals with the issue of surface contaminates analyses presently available on the market. The amount of variations of analyses and more important statements of the results cause great problems on the market. Described in the paper are not only the analyses possible, but also the interpretations belonging to them. However, salt measurements are used worldwide, its basics often appear to be a worldwide mystery. This paper should clarify the most common made mistakes.
Epoxy coatings are a mainstay of the protective and marine coatings markets. Used as intermediate coats over inorganic and organic zinc rich primers or used as direct-to-metal primers in coating systems, epoxy coatings are widely recognized for their versatility and the excellent corrosion resistance they provide. One drawback to current epoxy coating technology is that it requires separate packaging for the epoxy resins and the amide or amine hardeners because the chemical reaction between these materials causing the applied film to cure to a dry state would also cause the bulk material to gel if packaged together (pot life).
This paper takes a look at emerging environmental, health and safety issues that may impact painting contactors and facility owners. Specific topics include OSHA’s proposed revisions to the Hazard Communications standard, updated information on silica and hexavalent chromium, and expected rule making in 2010. Additionally, information will be provided on EPA regulatory actions related to NAAQS Lead and PM2.5 and other EPA regulations. Much of the information is taken directly from the respective agency’s published regulatory agenda, supplemented by anecdotal information gathered from various professional journals, seminars and conferences.
Discussion around the basics of shop-based air powered abrasive blasting, some of the criteria which should be considered when choosing a surface preparation method and ways to reduce costs associated with this process. Technologies and Industry Best Practices are often overlooked or circumvented in the name of tradition or cost savings- but the results of these choices can be very harmful. The conversation will be centered around taking steps to maintain or increase production, while increasing departmental profits.
Cleanliness of a metal surface prior to coating is imperative, just ask the paint manufacturers. Whilst there are several measurement techniques available to determine the level of soluble salts on a substrate prior to coating, Bresle is still considered by many as the “gold standard”.
SSPC-SP 13/NACE No. 6, “Surface Preparation of Concrete” has just been revised and given a major face lift. It is quite different than the previous 2003 version with more content. It became evident during the revision of the standard that there was wide and intense interest and so this presentation is meant as an introduction to the new standard highlighting the revisions.
Over 30 percent of the 607,000 bridges in the FHWA National Bridge Inventory have steel superstructures. Most of those are protected from corrosion damage by thin film coatings or paints. Those coatings have a finite life in relation to the steel they protect. Over time, they degrade, eventually requiring repair or replacement. When selecting this type of superstructure for a bridge, the operating agency incurs an obligation to maintain the coating on the steel to protect it from corrosion to obtain its full service life.