Can you find examples of a failure of the particular coating you’re working on? Now go out and inspect the coating and see what’s wrong with it. Coating Defects - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Activities of industrial and commercial painting projects. New technology. All Articles. Make copious notes, and don’t try to memorize things. Look for records of surface preparation, environmental data, blasting, etc. These nine structured steps, when performed during a failure analysis, will help to ensure you don’t miss anything. What is the morphology of the failure? Salt test & lead/heavy metal, surface preparation, mixing and application. Gas chromatography can determine exactly which solvents are in that coating. Coatings manufacturers will keep “retained samples” of each batch of coating that they make between two and five years. Defects may be either circled with grease-free chalk, marked on the drawings, or noted in the inspection report. JON R. CAVALLO, PE, FASTM, is a registered professional engineer in three states and holds a bachelor of science degree in engineering technology. For example, ASTM D610 is a pictorial guide to the degree of rusting that has occurred. There is also discussion of how coatings work with cathodic protection, cathodic protection shielding by coatings and other related issues with the various coating systems related to CP. Each section has been compiled by coating specialists who understand paint coatings and their application and as such will provide a useful pictorial reference to all who use and encounter paint coatings, their defects and failures. Gel chromatography looks for solvents that can cause failures, while ion chromatography looks for soluble salt contamination. Indication pipe to remote earth DCVG signal magnitudes (P/RE) are calculated using the following formula. Bruce is a NACE Certified Coatings Inspector Level 3 (Peer Review), an SSPC Certified Protective Coatings Specialist, a Nuclear Safety Related Coating Specialist, an ANSI N45.2.6 (ASTM D 4537) and a certified Insulation Energy Appraiser by the National Institute for the Uniform Licensing of Power Engineers and the National Insulation Association. The defect is the appearance of small holes in dried paint film. In 1993, following a coating defects survey, 31 cases of AC corrosion were found on a polyethylene coated steel gas transmission pipeline buried one year earlier. Repairing defects is normally not part of an abrasive blaster’s job description, but when you are charged with prepping the surface it’s imperative the coating adheres properly, and surface defects can prevent that from happening. Application of a hard topcoat over a more flexible softer undercoat. 2.2 DCVG % IR Calculation The NACE test method TM0109-2009 offers a formula to determine the severity of a coating defect or holiday. • Physical Property Tests: Several tests examine the various physical properties of a coating. NACE Standard SP21424-2018 AC Corrosion on a cathodically protected underground pipeline is commonly the result of a combined action of the AC voltage, the CP conditions, a coating defect, and the chemical and physical conditions of the soil. Write down the location of the project, the location of each sample you take, and the date and time you took the sample. Determine whether a unique environment exists in the area where the coating failed. You can use ASTM D714 to accurately describe the population of the blisters and how large they are. coating failure, including the underlying substrate, are often damaged, and of little use after testing. Probable Causes: Internal stresses in the coating where the surface shrinks faster than the body of the paint film. That could be very significant. • Solvent resistance testing — You can put a solvent on a clean cloth and rub it on the surface of the coating. A qualified laboratory will be able to recommend a method of analysis based on what you’re seeing in the field. This page can be found at https://nace.mydigitalpublication.com/article/Systematic+Coating+Failure+Analysis/3846889/688243/article.html. Review major literature sources, such as ASTM, NACE International, and The Society for Protective Coatings (SSPC). If the coating lasts more than 30 years, you can do a failure analysis, but it will be just for interest’s sake. The problem is most probably caused by too thick a coat trapping solvents into the film, or by air bubbles. Poor adhesion. Coating system failures occur in the field, but how do you determine if a coating has failed prematurely? Infrared spectroscopy can reveal if the wrong coating was put on. Coating Discoloration. Take a picture of the sample before you take it off the structure, and then take a picture of it after you’ve taken it off. Some tests are easier and better done in the lab than in the field. The coating has already failed, so you don’t have to worry about damaging it further. There is also discussion of how coatings work with cathodic protection, cathodic protection shielding by coatings and other related issues with the various coating systems related to CP. That can be detected by DSC. 3rd edition 2016 NACE. The laboratory will have access to known samples and known fingerprints, and they can match your unknown sample to those known samples. I’ll briefly describe the various tests that can be performed. Several tests examine the various tests that can cause you big problems )... — provided I got permission first: Typically, you can ’ t last forever ; they an... 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