This is fairly straightforward. The are two possibilities, primarily depending on the board quantities. If larger volume, have a tray made that holds the board. Place the board in the tray and then fill the tray with epoxy. Tray, board and epoxy make the final assembly.
For lower volume...
Yes, you have crevice corrosion. The crevice is formed between the band and the pipeline. If you do a Google search on pipeline crevice corrosion support you'll see a lot of examples. The more typical example would be carbon steel on both sides, (you have CS and SS combo). While the SS is...
You're going to need corrosion inhibitor(s) in combination with a low level of biocide. The oxygen scavenger will not work in this situation as there is too much air present. For a hydrotest or lay-up situation, an oxygen scavenger is used when there is basically no air present, like for a...
To modify the formulation, I'd look at adding a filler that has a "sharp" profile, perhaps some kind of silica or perhaps look at the paint anti-skid additives.
My first choice would be to leave the formulation as is and add an abrasion step after molding.
It looks like typical contamination. Any residue on the part surface runs the risk eventually sucking up water and then corroding. Just because it looks clean doesn't mean that there isn't any residue.
Take a serious look at your cleaning and rinsing process. Also look at how the parts are...
Looking at the picture, it is clearly an issue with your pretreatment. You can clearly see the drip pattern on the surface of the part.
A "typical" powder coat process means may things to many people. Are you using an alkaline cleaner or neutral?, Iron phospahte? Sealer?
Talk to your...
Normally the coolant in those types of systems are a mixture on inhibitors in a water/glycol vehicle. A mixture is necessary because of the wide variety of metals typically involved in the cooling system, Al, Cu, steel, cast iron. As would be expected, inhibitors that work for one metal may...
I would consider using a coextrusion. You can make the exterior layer any color that you want and look at loading it with anti-block materials to reduce the adhesion between pieces (akin to what they do for polymer films. You can also put less plasticizer in the skin, this will reduce the...
Can you deposit the coating on a different substrate? There are machines that can determine the moisture permeability of polymeric films. If you can deposit on something that was highly permeable to moisture like say polyester, you can then get an actual water permeation rate (weight of water...
It is very difficult to have a similar system for polyolefins as they are such a pain in the butt to get into solution.
There are polyolefins used in this type of application, look for Flame Spray of polyolefins, it is used on pipes all the time.
It basically take a polyolefin powder and...
You need to get detailed info about both paints. A 2 part PU has a urethane piece (aromatic or aliphatic) and and isocyante piece (TDI, MDI, etc). So all 2 part urethanes are not the same..
Hot rolled steel is typically more prone to this kind of problem than CRS. (You often get a scale in the HRS).
It is difficult to idnetify the probelm based on the limited amount of info that you gave, but a couple of thoughts:
- Examine the raw stock for signs of corrosion, this means looking...
A couple of points:
As the base color is black, the most likely pigment is going to be carbon black. In general, carbon black is very UV stable and is used as a UV stabilizer.
What you are describing seems more like chalking, which is typically a breakdown of the resin, which turns light...
