SSPC-SP 7 Brush off Blast Cleaning allows for a great amount of the original coating to remain on the surface and to roughen the surface prior to applying the new coating system. Preheating parts often leads to way to much powder applied to the part. Well it would depend on what type of paint or coating is on the part. Chloride Testing / Bresle Bresle Patch Method, SSPC-SP 5 White Metal Blast Cleaning (NACE No. Grab the uncoated sides of the wheel with gloved hands and turn it over so the masked hub is now sitting on the metal cylinder.5. Meaning if the bake schedule calls for 10 minutes @ 400 degrees you would only bake the part for 6 to 7 minutes. The coating inspection article explains about the chloride test, surface profile measurements, wet and dry film thickness measurement, etc. Surface Profile Measurement by Replica Tape (Press-O-Film or testex tape) is performed after sandblasting to make sure the sandblasted surface has the required profile as indicated in the customer coating specification. Currently, you go from Step 2, Disassemble & Clean to Step 3, Outgas. SSPC-SP1 Solvent Cleaning is an essential requirement and it is done before surface preparations such as SSPC-SP 10/NACE No. Other periodic laboratory tests may be needed. SSPC-SP 7/NACE No. SSPC-SP 5 White Metal Blast Cleaning (NACE No. Measurements of gloss and texture might also be necessary. However, due to the powders ability to wrap around parts, the hook mark will be much less noticeable. Powder Coating: The Complete Guide is an educational site for powder coaters. Disclaimer: Powdercoatguide.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. No, you do not need to preheat the part at all before powder coating unless you are doing so to outgas cast metal parts. Chloride Testing / Bresle Bresle Patch Method - The most of the coating specification requires that chloride testing ( Bresle Bresle patch Method) being performed before sandblasting. Keep the questions coming! You might need to perform the MEK rub test to insure that you have achieved proper cure and if the coated part eventually will be exposed to sunlight, you might send some samples to a laboratory that can subject the samples to a weather-ometer where UV light (and perhaps also humidity) will accelerate coating degradation. This subject is one of the important items in coating inspection process. Powder coatHopefully that answers your question, let me know if you have any more questions. Q: What will be the checkpoints to ensure a good quality powder coating (including chemical pretreatment)? Air Compressor Blotter Test Based is performed to identify oil and water contamination on the air compressor. The chrome will look like it has a texture. However, there are some scenarios where corrosion could start inside the barrel and eventually work its way underneath the powder. Generally speaking, the four basic tests discussed in this article should be included in any powder finishing process. If customers require a Class A finish, I would look for contamination and other defects in the finish. Did you find this article useful? The Test is conducted as per requirements of ASTM D 4285. Powder Coating: The Complete Guide is an educational site for powder coaters. When do I add clear coat or a second coat of color? Again, that may or may not be your concern but it may be useful for you. 2), Surface Profile Measurement by Replica Tape, inspection-for-industry.com Pull out the oven rack and set it on a table with a metal cylinder in the middle.2. If I can, I always try to hang a part from an area that will be masked off anyways, like a bolt hole. 2 near-white blast cleaning or SSPC-SP 5/NACE No. 5.5. The best way to find out about these powders is to directly contact the powder manufactures. Painting Process Audits. i just wanna ask? You can then spray the 2nd coat and put it in the oven for the 2nd coats full bake schedule. Also check out the more thorough article, ", Step 7: Spray part with powder coat using a, Monitor Temperatures using an Infrared Thermometer, Cleaning and Degreasing before Powder Coating, Powder Coating: Perfect for Car Restorations, Welcome to Powder Coating: The Complete Guide, How to Build a Powder Coating Oven Part II. Supplier audit checklists for special processes - Plating Process audit Checklist: Process Audits and Layered Process Audits: 2: Jun 12, 2005: J: 1.11 Preliminary Identification of Special Product and Process Characteristics: APQP and PPAP: 4: Oct 12, 2020: ISO 9001:2015 8.5.1 f - Scope with customer special process requirements The only reason pre-heating the part is done is to overcome faraday cage issues with cheaper powder coating guns. SSPC-SP 10 Near-White Metal Blast Cleaning (NACE No. Proceed to coat the sides and face of the wheel.6. 2 removes all dust, coating, and mill scale. I hope that helps out and I will definitely explain it more in detail when I get a chance to write some more articles. I have yet to coat mdf myself but it has been done and currently companies are working on lower temp curing powders for applications such as these. Check out the article on this site titled "How to Properly Ground your Parts". What should an auditor check during powder coating process audit? Search this Site! ... conduct this audit. Just like painting, there will be a hook mark when shooting powder. Just a word of caution though, these companies do not sell by the pound, they like to sell in bulk. Thanks for being a reader! More than 300 Articles! Sandblast (nothing dirty touches the part after this point and only handle it with clean gloves)4. So just to clarify, if the part has a prior finish (i.e. What should an auditor check during powder coating process audit? Outgas3. Lets say the 2nd coat is a clear coat that also bakes for 10 minutes @ 400 degrees. SSPC-SP 10/NACE No. Thanks for reading. 2) is to be used to clean unpainted or painted steel surfaces prior to applying a new protective coating or lining systems. Most paint is removed by the pressure washer cleaning step. The question then boils down to, does a part still outgas even with an existing painted finish? Project Audit Plan ... Only approved materials are used in the coating and painting process. What if the item has a prior finish, like paint? The soluble salt remains in metal surface even after sandblasting and can not be removed easily and cause paint failure through osmotic action and moisture absorption (formation of HCL acid) and cause metal corrosion beneath coating and finally cause paint breakdown. If necessary, look for pin holes and voids, especially if the coated part will be shipped to a corrosive environment. Then you would let the part cool completely to room temperature, and shoot your 2nd coat whether that be clear or a translucent candy. For more info on each of the steps listed above, you can find its corresponding article here on the site. Should be writing again this month so make sure to check back. It will contaminate your media and be redeposited on every part that goes through the cabinet after. paint) you outgas with the finish on it after you clean the part? Thanks and great work BTW! No, I always avoid preheating parts if I can. 1) I'm wondering when you hang your part to be powder coated does it matter where the part is hung from? Sandblasting works great to clean off dry things like paint or other previous coatings, but when you contaminate the media with something wet like grease or oil, your parts will not come out clean, there will be grease/oil deposits which will be difficult to clean off. Mask (if necessary)6. Any extra info regarding wood/MDF powder coating will be well received.Keep up the good work and thanks again. SSPC-SP 5/NACE No. Hi Sean,Thanks for this site and the work you put in.
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