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HISTORICAL DOCUMENT. The purpose of this NACE International standard test method is to specify test methods and test conditions used to evaluate thermal properties, insulation values, and performance/integrity before and after thermal aging of insulative coatings. Testing for corrosion resistance is not included in this test method.
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When protective coatings are to be applied to structures, it is important that the surface is clean and dry if premature failure of the coating is to be prevented and the full coating service life achieved. In many situations for both new build and repair of structures, blast cleaning of the surface is required to remove contamination and to create an anchor pattern to enhance the adhesion of the coating system to the substrate.
A new acrylic epoxy hybrid (AEH) water based dispersion has been developed for two-components coating applications for several years. This new AEH dispersion can be used to replace the conventional water based epoxy dispersions for concrete and metal coatings. The curing agent selection for the new AEH dispersion is critical for metal applications for both formulation stability and the performance such as corrosion resistance, water resistance and UV durability. This paper discusses the utility of using ζ-potential and water solubility in curing agent selection.
In this study, the effect on coating corrosion resistance after remediating an under-blasted then remediated to standard preparation is undertaken. In this work, it is proposed to under-blast one set of panels (~1 mil profile), blast to standard one set of panels (~3 mil profile) and remediate to standard a set of under-blasted panels (from ~1 mil profile to ~ 3 mil profile).
Quality Assurance/Quality Control (QA/QC), often referred to as inspection, is critical to the success of a protective coating or lining project. Several parties can and do get involved in inspection including the owner, specifier, third party inspector, general contractor, painting contractor, equipment supplier, and coating manufacturer.
Tensile pull-off adhesion testing is becoming a more frequent specification requirement for in situ quality assurance testing to confirm proper surface preparation and adhesion of high performance protective linings applied to concrete. It is also becoming a widely used test for forensic analysis of protective linings in existing installations. There have been numerous investigations leading to the development of different devices and test pull-off adhesion methods used to assess bond strengths of mortars and overlay materials
Pull-off adhesion testing is widely used to assess the protective coating process. It is also used to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate.
The seismic retrofitting of the County of Placer/Foresthill Road Bridge included replacing the gusset plates at the bolted connection points on the structure. Newly fabricated connection plates were prepared in the steel fabrication shop by abrasive blast cleaning and applying an inorganic zinc-rich primer. Existing connection plates were removed and the surfaces beneath abrasive blast cleaned and primed on-site with an organic (epoxy) zinc-rich primer. The connections were slip-critical.
Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile must be accurately assessed to ensure compliance with job or contract specifications. But is profile height alone (the most commonly measured parameter) a good indicator of long-term coating performance?
Corrosion under Insulation (CUI) costs industry millions of dollars. Water ingress into conventional insulation systems can result in accelerated corrosion of the steel substrate w hich, if unchecked, will result in structural failure of the vessel or pipe. If the structure is operating under high pressure then this failure would be catastrophic. CUI can result in significant loss of revenue from downtime, maintenance and replacement of corroded structures.
Thus to establish the precision of ISO 20340 Annex A six laboratories participated in a round-robin evaluation of ISO 20340 annex A test method for the first time. The aim was to estimate the repeatability and the reproducibility of this test.
Guidelines in the methods and techniques of collecting samples of corrosion products. These should enable collection of material suitable for successful analysis in the laboratory. Includes procedures in the analysis and identification of corrosion products. Historical Document 1973