Is Chromating Necessary after Rust Removal?

When You Need Chromating (or an Alternative) After Rust Removal

Rust Removal Alone Is Not Enough If:

• You want to prevent flash rust (rust forming again within hours or days)

• The part will be stored or painted later

• The metal is iron/steel and will be exposed to moisture or air

Why?

Rust Removers remove rust effectively — but they also:

• Strip the protective oxide layer

• Leave a clean but highly reactive surface

• So, flash rusting occurs quickly, especially in humid air

What Chromating Does

• Forms a passive, corrosion-resistant layer

• Especially used on aluminum, zinc, and steel

• Helps in paint adhesion and long-term protection

But: Chromates (especially hexavalent chromium) are toxic, regulated, and being phased out globally.

Recommended Approach (If NOT Using Chromate):

After Rust Removal:

1. Neutralize surface
   → Use mild alkaline rinse RXSOL Alkaline Cleaner

2. Apply temporary corrosion inhibitor
   → Use something like:

   • RXSOL Rust Guard Rust Preventive

   • RXSOL Corrosion Rust Preventive Wax

3. OR Apply Primer/Paint Immediately
   → Especially after phosphoric acid treatment (etches + preps)

For effective Rust Removal Solutions, feel free to write to us.