I wouldn't recommend it even if you had to pay for them. Use Titanium.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, April 16, 2007 12:58 AM
To: [log in to unmask]
Subject: Re: [TN] stainless compatibility in alkaline etchant

I would not recommend stainless steel where there are free chloride 
ions. Use titanium.

Brian

Adam Seychell wrote:
> Does anyone know if stainless steel 316 corrodes when exposed to 
> alkaline ammonia chloride etchants ?  I have this diaphragm pump with 
> internal stainless steel fasteners which are exposed to the etchant.
The 
> pump elastomers are EPDM and santoprene, and body material is glass 
> filled polypropylene. I am wondering if the pump can be used for 
> alkaline etchants.
> 
> For a test I placed some stainless steel in etchant at let standing
for 
> one week. There was no visible surface corrosion, nor any measurable 
> mass loss. I know this doesn't tell me I can use the pump and expect
it 
> to last.
> 
> 
> best regards,
> Adam Seychell
> 
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