published | Tags: #Guide #Parts #Phosphating

ROCKET VAPOR from classicoldsmobile.com recently went through the steps of coating some of his 70 442 parts liquid phosphate. Phosphating helps a steel become resistant to rust. The results appear to be so good, that he wanted to share the process.

Step 1 - Buy the product
You will need a bottle of Zinc and Manganese. In the example, they were purchased from Palmetto Enterprises.

Step 2 - Create the solution
When you purchase the liquids, you will then mix them together with distilled water (exact proportion included in package) and then heat the solution in a stainless steel pot to 190 - 210 degrees F.

Step 3 - Dipping the parts
Let the parts soak in the solution for 10-15 minutes.

Step 4 - Removing and Drying
Pull part from solution and spray part with WD-40 and wipe dry. Repeat spraying with WD-40 and wiping dry for a total of three times to remove all of the plating by-product salts. Spray with Boeshield T-9 protectant to preserve and protect part from rusting.

Note: there is no drying time, this is a chemical treating process. Once the part is rinsed clean with WD-40 the part will be ready to go. GM used this plating for its anti-wear and anti-corrosion properties. Most all of the under hood bolts are black oxide (maganise phosphate). Most all hood hinges, hood latches, misc brackets under hood/ suspension, and suspension coil springs were zinc (light gray) phosphate. I have used this chemical on many springs with no problems.

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