Blast Cleaning Standards: Cutting through the ... - aca conference

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Coatings Inspection – How good is good enough? An Inspector’s viewpoint Tony Ridgers 1 Akzo Nobel Pty Limited, International Protective Coatings Australia Presenter email address: Tony.Ridgers@akzonobel.com Abstract Coatings inspectors are very capable and qualified in carrying out their duties and are ultimately faced with having to make a “go – no go” call on the final quality of the applied surface finish providing correct selection of system used. There is no grey area, especially in critical applications which include; immersion applications such as tank linings, chemical storage/protection, high temperature and passive fire protection. ACA and NACE Coatings Inspectors undergo a very comprehensive and rigorous training regime which not only includes how to use specific inspection equipment but the interpretation of the results obtained from such equipment and the reporting of such results. A Coatings Inspector has the experience to interpret coatings specifications together with the intent of the manufacturers data and their relationship to the applied finish A Coatings Inspectors role is the final audit of the physical protection of a surface from its operating environment by the protective layer or coating whether it is a liquid applied protective coating, HDG, tile, rubber, glass or passive fire protection, after all, it is this layer the client has paid for in protecting his asset from degradation The delegates attending the conference will be given the opportunity to travel along the inspection trail and see some practical issues facing the Coatings Inspector. Speaker Biography: Tony has extensive experience in the protective coatings industry for 34 years with 11 years “hands on” as an owner/operator of an abrasive blasting and coatings operation (both yard and field) covering the areas of industrial, pulp and paper, marine, high value infrastructure, mining, power generation, up stream oil and gas. This business was also heavily involved in protection of concrete in aggressive environments with the use of spray, trowel and hand layup protective coatings. Tony has ACA coatings inspection certification, is an ACA Corrosion Technologist and holds NACE Level 3 Coatings Inspector certification.
Inhomogeneity of organic coatings and its effect of protection Sina S. Jamali 1 , Douglas J. Mills 2 1 Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong, NSW Australia 2522 2 School of Science and Technology, University of Northampton, St George’s Avenue Northampton, NN2 6JD, UK Presenter email address: Sina.Jamali198@uowmail.edu.au Summary An important aspect of polymeric coatings from the protection point of view is their inhomogeneous nature. Phenomena such as lack of cross-linking, inappropriate pigmentation, quick solvent evaporation etc may introduce local micro defects. The diffusion rate at these micro defects is proportional to the ionic concentration of the solution at which the coating is immersed and therefore they have been known as “D” or direct type areas. On the other hand is the highly resistive “I” type area where the ionic resistance increases with increasing the ionic concentration of environment. It has been revealed that corrosion proceeds through the ionic conduction pathways within the coating layer when the metal is protected by an organic coating. Traditionally it is believed that a certain level of adhesion is a fundamental requirement to avoid anodic and cathodic areas connecting underneath the coating. Therefore the ionic resistance and specifically D type areas play an important role to determine the anticorrosive properties of paint. In the present study a set of organic coatings in the form of detached coatings has been examined using DC technique to determine the D/I type ratio. The significance of thickness and curing condition on D area formation has been also investigated. Consequently coatings were applied on steel panel and the corrosion behaviour was looked at in the long term. Also the adhesion strength of coatings was examined by pull-off method. Results indicate that the protection efficiency of coating is mainly governed by D/I type ratio but is relatively insensitive to the adhesion strength. A theory of how the permselectivity of coating influences the protectiveness will be advanced.
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Page 3 and 4: The Effect of Cationic Surfactants
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Page 8 and 9: Control of Corrosion of Mg alloys u
Page 10 and 11: Electroless Ni-P-PTFE-Al 2 O 3 Hybr
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Page 16: Thermal Metal Spray: Successes, Fai

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