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Questions tagged [surface-preparation]

15 questions
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Cleaning anodised aluminium

We have some metal parts in our machines, which are anodised aluminium. Those machines are due to be shipped to the customer in the near future, but I have noticed some pitting or slight rust developing on some of the anodised aluminium surfaces. I…
am304
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How can I get a quick 2B shine on grade 316 stainless steel?

I have a stainless steel (316) 2B finish strip. I tried buffing the material for a shiny surface but it takes lot of time to finish my production. So, I want to know if there is any chemical available or any more simple process which I can do…
Dipak Panchal
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In what cases are the roughness values Rt and Ra used?

Roughness measurement instruments output those two values, where Rt is the distance between the top of the highest peak and the bottom of the lowest valley, and Ra is the average distance of every point to the mean line. In almost all technical…
user47228
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How to do gold plating on Anodized aluminum and stainless steel?

I have done some research and asked in a few forums for gold plating on anodized aluminum and stainless steel but haven't yet found the answer to my questions. What are the chemicals for pre-processing the surface and the suitable gold solution for…
user1314404
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How land is made flat at scale

For building something like a big building or a parking garage, there is a need for a large flat surface of concrete. Wondering how they make the dirt and the concrete flat. It's hard to make a tiny flat surface at the beach in sand let along…
Lance Pollard
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Buffing/Polishing bulk Aluminum

I'm buffing the years of built up dirt off a aluminum grain tipper trailer, using a woolen buffing pad mounted on a angle grinder. I'm going in a upwards & downwards motion with great success, however, that's the pattern it's leaving. 1st I thought…
Rooey
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Can anyone suggest an Economical way for Polishing wound Wires?

I am working as a mechanical design engineer. At my work place, we were making chairs with 12 mm diameter wire via bending. We were using mild steel flash wires which was like the perfect wire with almost 0 to minor roughness. Recently because of…
AKKK24X7
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How is EPD different / related to anodising?

What is the process of applying dye to anodized surfaces (specifically aluminum)? Is electrophoretic deposition (EPD) just the process used to apply the dye to anodised surfaces? Or is it a different type of coating?
mewa
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How to avoid oxidation of Si using a sub nanometer layer

Which material can be used to protect a Si layer from Oxidation by a sub nanometer layer?
james
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Legend or not: wood coat should "breath"?

I am going to stain some pine boards, then coat them with boiled linseed oil. The latter should let moisture to diffuse through (correct me if I am wrong), but the water-based stain produces poorly permeating barrier (according to the manufacturer).…
Imsa
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Grade C surface plate

Surface plates come in three grades: AA, A and B. The AA grade has the best flatness, while grades A and B have respectively 2 and 4 times less accuracy. Grade B is still much flatter than normal surfaces like tables, doors, windows etc. According…
Riemann
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Conventions regarding sliding and press-fit tolerances for shafts and bearings

I often build things (3D printers, skateboard wheels, bicycle parts) that use off-the-shelf ball-bearings. These ball bearings are available in nominal mm sizes, and to the limit of my measuring tools, tend to be ground exactly to size. For example,…
BetterSense
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Engineering standards or testing standards for hot punched metal holes for rolled steel

So, I have a problem with fatigue cracking originating from hot punched holes. From failure forensic reviews, it seems like surface conditions contributed to some of the failures, especially where there are leftover shear marks and laps from…
Isa
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Surface Finish and Strength

Does surface finish affect steels strength properties? If so, how does strength increase or decrease with the type of surface finish applied?
Drees
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Would it be possible to put an anti-condensation coating on, say, an ice bag such that it will not get wet in use?

I have seen anti-condensation coatings for glass, but as far as I know they're designed to cause any moisture that does form on them to sheet rather than bead. They do not, however, actually prevent condensation, and I don't see how any product…
BillDOe
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