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MIL-DTL-5541 chemical conversion coating
2

thread116-264778

MIL-DTL-5541 chemical conversion coating

MIL-DTL-5541 chemical conversion coating

(OP)
The latest version of Subject standard defines two types of chemical:  Type 1 and Type 2.  These types determine if the chemical contains hexavalent chromium.  The older version of the spec specified only classes of treatments:  Class 1A and Class 3, for example, determine the thickness of the surface treatment.

What if one does not specify the Type of treatment and instead calls out only the Class of treatment?  What Type of treatment is received by default?  Or is the specification incomplete in that there is no default defined?

Tunalover

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RE: MIL-DTL-5541 chemical conversion coating

Hi. How much corrosion protection do you need?  The difference between hexavalent and trivalent chromium is night and day.  Seems the specification is incomplete.  However, ask for "Fred" or "Chris" at Luke Engineering: http://www.lukeeng.com.  They will have the exact answer you need.

For more information on corrosion resistant coatings, I'm always glad to help:    
<a href="http://www.industrialcoatingsworld.com/Corrosion-Resistant-Coatings/index.html">Corrosion Resistant Coatings</a>  

Best wishes    

William Gunnar
http://www.IndustrialCoatingsWorld.com
 

RE: MIL-DTL-5541 chemical conversion coating

(OP)
coatingengineer-
On paper the level of corrosion protection for a given Class is the same whether the Type is 1 or 2.  The level of corrosion protection I need is simply to suppress oxidation at the surfaces of aluminums which is what this coating is supposed to do.
 

Tunalover

RE: MIL-DTL-5541 chemical conversion coating

Per MIL-DTL-5541F, Pg 3, Para 3.1 "If no material type is specified type I shall be used. ..."

Rerig.

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