Forum Posts

rickbaillie23
May 03, 2018
In Niobium & Titanium
Anybody have any comments regarding how to best ”pad” an anodized raised patterned disc without removing the unraised background, near its edges for example? Which Micro-mesh Soft Touch pad grit typically works the best? It seems just the slightest pressure in an effort to remove the first anodized background layer off the raised pattern surface also tends to mar the unraised area too. The coarser the pad, the worse it is. Seems there is an ”optimum” grit that hits only the raised pattern, leaving the background in tack, while having enough ”bite” to get the job done without overdoing it and marring the background. Making a lot of scrap and little finished product. Thanks again, Rick
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rickbaillie23
May 03, 2018
In General Discussion
i’m fairly new to anodizing niobium and only use the techique as called for with a project. I don’t do this every day as you likely do in your shop. Thus, my TSP and etching solutions may be ”older” than yours at times. I can always make up fresh TSP solution in small quantities and ensure I’m always using fresh solution, but the etchant is more problematic. The way it is packaged I have to make up the whole 1/2 gallon of the 2X concentrate all at one time. (I would make smaller lots if I could divide the dry powder accurately, better yet buy it in smaller units.) I then make up only 1 cup of the 1:1 dilution for a hot etch. After use I always decant it into a heavy polystyrene (?) lidded container for reuse later. I toss this diluted solution if I notice any color tint. Sorry for the long intro ... Because my use is so limited at times, these soultions tend to ”age in place”. Are there any tell-tales to look out for as an early indicator that it is time to use fresher reagents, or explain what I’m seeing when things go differently than expected? Thanks, Rick
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rickbaillie23
May 03, 2018
In General Discussion
Mechele, you once advised me in an email to use these pads to ”roughen” up the surface of niobium for a brighter finish as opposed to using a polish. I tried this with 4 different meshes spanning range of ”grits” in the set from 100 to 400. I was surprised to see no notable difference from the coarsest to finest mesh. I tried to follow all the metal-free steps: roughed up the surfaces with the pads, scrubbed with Simple Green, rinsed in distilled water (d/water), hot etched, stored in d/water, anodized at 33 volts, rinsed in d/water and dried with hot air gun. Sadly all my hard work didn’t pay off. Thiughts?
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