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Thanks Saberblue, Just today I asked my boss to buy a ph meter, based on what tomwalz posted, and I was thankfull for his post he sent me in the right direction. You have given me more detail. Sounds like you know what your talking about, it makes sense. I will look into it. 25 years experience...

Thanks everyone. These are all great suggestions, I have thought about a ph test. This discoloration will show up on maybe 2 parts. Then maybe again 2 months later. On random machines. 25 years experience in aluminum die casting

No, the cnc machines have the same parts ran on them everyday. 25 years experience in aluminum die casting

Hey all, I am having a problem with discoloration on the machined surfaces of aluminum die castings. These parts are cast from A383 aluminum alloy. The discoloration is kinda a brownish colored tint, maybe a tarnished look. If I scratch it with a knife blade, it is shiny underneath, so it is on...

It is rutine for the workers to come. They are for support and to set up equipment, they do not come to sort. We are tight with toyota, our owner is close to toyota. They love our work and quality. We have recieved awards and toyota continualy want us to take on new business. Our parent company...

At my plant, we have a couple of customers who are offering us more business, but we do not have the capacity, once our new jobs start production, as I stated previously. This a good company, it will be here a long time. This is why I believe I could work here until I retire. Thats why it is a...

Thanks for your advice JMW.

OK, Thank you. I wiil look there. Jerry Davis, 25 years experience in aluminum die casting

Thanks guys.

Thanks moon161. I will keep that in mind.

Yes I am looking for oxides in A383 aluminum alloy. Jerry Davis, 25 years experience in aluminum die casting

Thanks for your response. I will look for permcoat. In the past I could pour 20 samples, no problem. Now I can only pour 10 or 12 and my mold is too hot, using the graphite spray. I wonder is there some type of ladle coating I can use? Jerry Davis, 25 years experience in aluminum die casting

Hey guys, Thanks for your responces. It has got me thinking. I think I know what I will do.

Does anyone know what I can use to coat a k mold. In the past I used a certain type of graphite, it worked great but I don't know where to get it. Currently I am using a dry graphite from a spray can, this not working too well. The mold is getting too hot and my samples have heat shrinkage.

Hey all, I am trying to make a decision. I spent 20 years working in a large casting plant, gained a great deal of knowledge and experience. The plant closed, I then went to work in another casting plant, a new plant suplying parts to toyota. I have a great job here, working in qa lab making...

my spectrometer is a shimadza OES-55OOII,Thanks for yor reply on this you have been very helpful, Thank you.

The spectrometer is a shamadzu

This is in NH41, An aluminum alloy for die casting.

Is phosphorus levels hard to detect by a spectrometer and should the results vary, like from .001 to .003 on the same sample?