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This paper introduces the available technology of chemical coating removal as an alternative to mechanical coating removal by comparing and contrasting the advantages and disadvantages of each chemical coating removal technology. Due to the high cost and environmental drawbacks of mechanical methods of coating removal, chemical coating removal systems have advanced as a cost effective and environmentally friendly way to remove coatings that are highly cost effective on a per square foot basis cost comparison. The presentation will discuss all chemical coating removal technology, features and benefits.
Modern design, manufacturing and field-testing specifications include surface profile and adhesion testing on the assumption that they are linked to long term corrosion prevention. There are a number of careful studies, dating back decades, that find no link between measurements of adhesion and (undercutting) corrosion performance, but other studies do, and the concept remains intuitively appealing and widely assumed.
To address questions and concerns in the protective and marine coatings market, new laboratory data has been generated regarding corrosion rates and mechanisms that will help eliminate some of the assumptions regarding the role of soluble salts. These assumptions include soluble salt types such as chloride, sulfate, and nitrate along with the resulting conjugate corrosion products.
Coating application on the exterior of ocean-going vessels and offshore platforms is normally very time sensitive, and frequently must be performed during times of high humidity, sweating hulls and daily rain showers. This paper will describe the use of solvent free, surface tolerant epoxies that can be applied to wet surfaces during times of very high relative humidity. Both the positive and negative aspects will be covered.
Organic coatings protect the underlying metallic substrate against corrosion by acting as a barrier to corrosive species such as water, ions, and oxygen. Unfortunately, coatings might contain defects and could degrade or disbond under some environmental conditions, resulting in favorable pathways for such corrosive species.
Barrier protection is one of the modes by which intact coatings provide protection to metal substrates through a reduction of the transport of materials, ions, or charge.
The corrosion behaviors of pure titanium UNS R50250 and UNS R50400 were investigated and compared with electrochemical behavior of Ti-0.2Pd and Ti-0.3Mo-0.8Ni alloys (UNS R52400 and UNS R53400 respectively).
Metal has been used in orthopaedic implants due to possessing excellent corrosion resistance and bio-compatibility. During recent years there has been serious concern using metal implants as release of metal ions from the implant can lead to genotoxicity and immunological effects with one of the principal factors that lead to this being the electrochemical reactions of the implant with salts proteins and other organic substances in the body. Continuous degradation also affects the lifetime of the implant; lifetime of the implant is a current priority due to the increased need for joint replacement in younger population.The focus of this research is to fully understand the surface/environment interactions that occur on CoCrMo alloys whilst in a protein-containing environment. Electrochemical techniques to measure corrosion rates and post –test assessment to assess mechanisms under a variety simulated body fluids have been used. X-Ray Photoelectron Spectroscopy (XPS) has been employed to analyse the surface chemistry of CoCrMo throughout the formation/dissolution of the organic/metallic tribo-film whilst In-Situ AFM has been utilised to monitor the build up of proteins in real time to determine how reactant films resulting from protein/surface interactions are formed. This study has shown that the presence of proteins has a substantial effect on the metal/oxide/electrolyte interface and this subsequently affects how the metal will behave in an implant environment
The development of new elastomeric waterborne acrylic resins for use in surfacetolerant maintenance coatings will be described. Applied in thick films of up to 10 to 20 mils, these coatings are resistant to mudcracking, and form an excellent barrier coating for the protection of steel.
This paper summarizes the survey results on crude unit overhead corrosion control practices. The survey was conducted by TG 342 which was assigned to update NACE publication 34109 “Crude Distillation Unit – Distillation Tower Overhead System Corrosion”. As part of the survey refiners provided responses about their respective chemical injection and monitoring practices. The survey focused mainly on atmospheric towers and included the following topics: overhead water wash caustic addition desalter acidification filming/corrosion inhibitor and neutralizer injection salt point and water dew point sampling and corrosion control performance. With respect to vacuum towers overhead pH control is also discussed. This paper presents summary statistics of the responses for each of these topics and is intended to give the reader a more comprehensive insight into general practices that are being employed across the industry.