Surface cleanliness cast steel

[jangolobow]

Hay!

I am searching amethod for surface cleanliness measurements on cast steel surface. Does sbdy has some experineces on this subject? We need to measure surface cleanliness and detect it. The surface is not flat. What do you use? It is a manufacturing application!

Thanks in advance!
G

 

[EdStainless]

What are you trying to detect?

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P.E. Metallurgy, Plymouth Tube

 

[dbooker630]

If it is casting flaws I suggest purchasing a copy of the ANSI/MSS SP-55-2011 Quality Standard for Steel Castings/Visual Method for Evaluation of Surface Irregularities. The standard contains reference photographs that can be used to develop your internal requirements.

 

[jangolobow]

Hay, thank you for answer,

we are trying to detect amount of oil grease fat which stays after assembling our product made of cast. we not interested in particle contamination. do you suggest some methods? we have standard visual method are not enough for us. we need a quantitative method. do you have some experiences? problem is our surface is compex we do not have flat surfaces.

 

[arunmrao]

If you can add a picture and tell us more about applicatio of the casting.

Your requirement is to clean internal cavities of the casting . Have you tried cleaning in ultrasonic bath.

"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

 

[Tmoose]

Hi jangolobow,

You should have included the information from your 23:16 reply in your original post, plus more.

For instance, you recently said you are interested in the "amount of oil" on the surface, and "after assembly."

I am guessing that you may be painting the assembly, and are having adhesion or surface quality problems.

Am I close ?

 

[bobjustbob]

To test for carbon, metal and fiber left on the surface of ground parts we do a cleanliness test. We take some solvent, run it through some filter paper a few times to make sure its clean. Then we wash the component and capture all of the solvent. The solvent is filtered again to capture all of the contaminants on the filter paper. The filter paper is weighed before and after to get a weight of material pulled off of the part. The filter paper is viewed under magnification to look at the size of the material and what it is. The weight of material is compared against the surface area of the parts. Small parts are easy, they go into a beaker or pan in the ultrasonic cleaner. The large parts are more difficult. We use a Hudson sprayer and utility sink to clean those up. The test itself is not a big deal, getting the solvent and equipment cleaned up takes the bulk of the time.

Bob

 

[TED7]

Similar method to Bob's but on large forgings.

Soak a known clean white cloth in acetone (tend to buy both of these consumables in with a certificate of cleanliness rather than filter / clean them) and take swabs of the material surface, inspect the cloth for debris / staining.
You'll need a selection of photographs to compare the swabs to of what is considered clean and how to identify what contamination you're seeing on your cloth. You'll also need to consider what you will accept as clean and what kind of lighting you'll inspect the cloth under.