– Jimmy Fix-it Nov 10 '16 at 15:11 A cast part has trapped pockets of air in the body of the casting that may cause blemishes in the coating during the cure cycle. : We are having trouble getting consistent quality and yields. Logically, the first suspect would be the cleansing treatment. Our first-pass yield is inconsistent, and our rejects are too high. They also produce holidays in the coating … Take the process back to the beginning so that a definitive corrective action can be initiated. Is It Possible to Powder Coat Chrome Materials? 2. Bayswater North VIC 3153, Optimized by When timer goes off, pull tray out of oven. Again, preprocessing will correct the problem by paying particular attention to the site of the bend. Is it random areas of the part’s surface, or is it more likely to occur in the same areas all the time? Also, they may not want too many different rack designs around. So, without further ado, it's time to make out a new resolution and find out just what causes air bubbles, cracks, and peeling in a newly coated product. If the coating is applied too thick or too viscous, any bubbles that are created can become trapped in the coating before they settle out. Never rack on dirty hooks unless you want to have a lot of rejected parts for light coat and orange peel, and you like to waste time, powder and money. The powder coating … This condition suggests a preprocessing error, although several causes are possible. Pre-Treatment Process of Materials before Powder Coating.  2021, The Voice of the Finishing Industry since 1936. Note, if the bubbling … ... a gas or substance is mostly trapped within the material but has a small break at the surface causing bubbles … Look at the location and area in which the failure occurs. I want to know if it is possible to apply powder coating on cement/concrete material. All Rights Reserved. … A pre-heat stage will eliminate the trapped air. Use "topping" mud rather than "joint compound", it works better for skim-coat applications. In following this guide, we're going to ring in the New Year with high-minded decorum by bending powder coating failures to our will. Decrease the surface tension of a mold by dusting a powder on the surface. If the problem occurs in isolated areas on the part, it is probably a die-release product. But take your time to get racking right and you should find more profit. Preheat the Part – Since outgassing is caused by gas bubbles being released when the object is heated during the powder coating process, it can be avoided by heating the object before the coating process … The remedy: Apply thinner individual layers, and allow a flash-off time between coats to let any excess coating … I think the problem may be related to how we rack our parts. Some of our racks have a lot of buildup on the contact area, and rack maintenance is not always a high priority. The coating has properly adhered to the part, and there are no suspected pre-process problems, but the powder isn't cross-linking properly. In this article, two industry experts tackle some common questions about the fluidized bed process…, Copyright © The reason for bubbles in your paint is contaminants on the surface before you begin the painting process. Composition of the Substrate. For more than 50 years, fluidized beds have been used to coat parts with powder coatings. Appearance Issues: What Happens When a Powder Coating Equipment is Already Failing? Powder coating is a widely used painting and coating technique to create protective and aesthetic barriers on products from vending machines at municipal pools to washers and dryers, or cars sitting in your driveway. Total coating thickness was measured using a Type 2 electronic film thickness gage operated according to ASTM D7091, Nondestructive Measurement of Thickness of Nonmagnetic Coatings … The powder coating process is fairly simple once your part is prepped for powder. Why does powder coating flake off, bubble, chip or crack? Parts should be racked consistently, and all hooks should be full. This last production flaw turns a silk-sheened finish into an embarrassing mess. As for adhesion, if the powder does not stick, it is because you have not cleaned and prepared the surface correctly. We use the same five-stage washer that we use for steel parts, which cleans and then applies an iron phosphate conversion coating. Note, if the bubbling effect is occurring at a sharp bend, there may be micro-fractures in the metal. Either the timing and temperatures are not being set according to the powder coating data sheet, or the oven's sensor isn't regulating the bake temperature according to its design specs. This event alone will cause bubbles to form. Watch and learn how to spot craters and fisheyes, what can cause them and how to fix it! Usually some form of surface contamination or outgassing is the cause of flaws in powdercoating. As such, there are other possibilities that could cause the finish to bubble, crack or peel. The easy way to powder coat bullets:First, start with non-lubed cast bullets…Next, put the bullets into a tumbling container and shake until all are evenly coated, about a minute…Pour bullets and paint into a strainer/sieve, then shake the excess paint onto the cardboard…Place bullets in tray, then into the oven…“Bake” for 20 minutes at 400 degrees. If you are using colored resin, you can even choose a powder that matches the color of the resin you are using. We are wondering if iron phosphate is effective for zinc, or are there other options for zinc treatment? Use a delicate paintbrush to dust in the powder… The powder coating is peeling until the underlying metal or preprocessing layer becomes exposed. A small amount of baby powder can work to reduce bubbles in resin. Additionally powder coating will react and bubble or peel if it’s applied to a dirty or contaminated part. The outgassing that causes these tiny bubbles is generated by solvents, mold release agents grease, and machine oil that are not removed from the galvanized steel before the polyester resin powder … I have noticed that sometimes racks are bent or have missing contacts, so we run them not fully loaded or lose ground contact on some parts. Does it only occur on certain parts or many different parts? Racks can help you be profitable if you understand good principles and take good care of the racks. Parts should be racked close enough to take advantage of the space available but far enough apart to allow plenty of time for the guns to get good coverage. I think the problem may be related to how we rack our parts. I have tried powder coating on some of the cement products, but because of the porosity of cement, heated gas are released to the surface creating "bubbles" on the coating … It sounds like you are seeing outgassing due to porosity in the casting. Simple hooks are fine if they hold the right number of parts and meet the other goals for good racking. You can build samples to test different racking set-ups and compare the results from one option to another. Proceed without issue, but the powder again about a thorough audit of the racks Plants, Upgrades to in. Are possible first-pass yield is inconsistent, and all hooks should be racked consistently and! And there is a good chance you can even choose a powder on zinc castings not cleaned and the... 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