Sandblasting (abrasive blasting) is one of the most effective ways to clean and prepare steel, aluminum, stainless steel, and hot-dip galvanized steel for powder coating.
At over 100psi at the nozzle, the blast media is propelled towards the work product and removes mill scale, rust, oxides, or previous coatings.
The benefit of this is threefold:
- The material is cleaned
- The blasting leaves an anchor profile that increases the bond strength of the coating
- The corrosion resistance is increased due to the increased bond strength.
While there are many blasting shops that you could choose from, there are only a handful of sandblasting shops that are able to provide coating in the same facility, let alone powder coating. Even if you have the blasting and coating done in the same day, the simple process of shipping the goods from the sandblasting shop to the coating shop can introduce a number of contaminants that will cause the coating to fail prematurely.
Things to consider when sandblasting
When preparing to have a job sandblasted, some considerations need to be made to ensure the job is done as efficiently as possible both for time and cost.
Below are a list of some questions that can help. Click on any question to reveal the answer.
Blasting is not an effective method to remove grease, oil, or other lubricants. Even the presence of caulking or gasketing can create problems. The risk of blasting this is that it will contaminate the blast media, and spread contamination all over the work product; this in turn leads to premature coating failure and an expensive media reclaim bill.
At Aegis, we are equipped to degrease some parts, but prefer that product is sent to us free of these contaminants.
There are some industry standards, such as AWWA-C213 that have specific requirements when it comes to the type of media and blast cleanliness that is required. Please let us know if you have a specific standard that must be met.