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Dow 7 Magnesium Treatment Compound #680-295
 
Dow 7 Magnesium Treatment Compound
Price:
$164.75
Chemical Name:
Dow 7 Magnesium Treatment Compound
Synonyms:
Dow 7

Product Description:

The Dow 7 magnesium treatment compound is provided as a pre-

mixed powder that is dissolved at time of use in 4 gallons of water. 

This will produce enough solution for a 4-gallon immersion bath.

 

The complete process will require the initial activator solution which

is available as either Type I or Type II.  Scroll down to the “Related

Products” section below to see the activators and description for their

proper selection which is alloy dependent.

    

Introduction:

Magnesium and its alloys are more galvanically active than even zinc

on the galvanic series.  Magnesium will form a strong galvanic cell with

every other metal it comes into contact with and is always sacrificial. 

When magnesium corrosion is detected, it requires immediate attention

or the corrosion will spread throughout the entire structure.  Therefore,

these alloys must be properly protected from corrosion damage.

 

Background:

Dow 7 is a good choice for both new and overhauled parts that have

dissimilar materials such as inserts, or where conditions will tolerate a

less robust and less costly alternative to Dow 17 anodizing.  It makes

an excellent paint base and provides the best corrosion protection of

the available chemical coatings for magnesium. 

 

Dow 7 is a chemical conversion coating which results in no appreciable

dimensional change to the component.  The surface of components coated

with Dow 7 is changed to a brassy or dark brown finish depending on the 

alloy.  Note that this coating film is dielectric (non-conductive).

          

Process Description:

The complete process requires two steps.  The first step is an activator

immersion which is done at ambient temperature in the range between

70ºF and 90ºF.  This is followed by a distilled water rinse.

 

The second step will require a stainless steel vessel that will allow

the heating of the Dow 7 solution to boiling point (200ºF).  Immersion

time for the parts is about 30 minutes, also followed by a water

rinse before allowing to hang dry for 24 hours.

 

Specification & Certifications:

The coating produced by proper application of the contents of this solution

conforms to SAE AMS-M-3171, Type III (formerly MIL-M-3171, Type III),

sometimes referred to as “Dow 7”. 

 

Exceptions:

Not for use on the following magnesium alloys: EK30A, EK41A, HM31A,

HM21A, HK31A, La141A and M1A.  Due to their chemistry, no coatings

form on these particular alloys.

 

Application Notes:

Castings containing bearings, studs, and inserts of brass, bronze, steel and

cadmium-plated steel may be treated using this process.  Note that aluminum

inserts will be rapidly attacked by the Hydrofluoric acid present in the Type II

activator.

 

Use alkaline cleaners containing less than 2% caustic for ZK60A, ZK60B and

some Magnesium Lithium alloys, as dimensional losses due to etching may occur.

 

Limitations:

Extended exposure of the developed coating to elevated operating temperatures

in excess of 150ºF will dehydrate the coating resulting in reduced corrosion

protection.

 

Packaging/Size:

Powdered chemical compound comes packed in 1-gallon can to be dissolved

in 4-gallons of water.


Quantity:
 
Related products
 
Activator Type I, Dow 7 Coating
Activator Type I, Dow 7 Coating
See details

Price Each: $98.50
    Activator Type II, Dow 7 Coating
Activator Type II, Dow 7 Coating
See details

Price Each: $162.04
 
 
Magnesium Treatment Kit
Magnesium Treatment Kit
See details

Price Each: $153.95
     
 

 

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