Mordant Solution: A Complete Guide

Mordant Solution: Everything You Need to Know

Mordant solution is one of the most commonly applied pre-treatment methods before painting a galvanized surface. Applying mordant solution on a metal surface requires a chemical reaction that will ensure adhesion and durability for a coat of paint. What is mordant solution, how it works, its applications, and T wash and etch primers are to be compared are going to be discussed here.

What is Mordant Solution?

Mordant solution, otherwise known as T wash, is a chemical solution prepared to etch non-weathered, untreated galvanized surfaces before painting. It acts by making an etching reaction with the surface and turning it black, thereby proving it ready for priming. This procedure removes oil, grease, and dirt that act as contaminants.

What Is Mordant Solution Used For?

Mordant solution is mainly used as a pretreatment of galvanized steel to:

Improve paint coatings adhesion
Surface contaminants such as oils and greases are removed.
This readies the surface for duplex coatings, for example paint over galvanizing.

T Wash Mordant Solution: All the Essential Information

T wash is one of the most common mordant solutions applied to treat new, unweathered galvanized surfaces. More favored because it is rather easy to apply and will have a visible chemical reaction.

How Does T Wash Mordant Solution Work?

T wash contains phosphoric acid and dissolved copper salts in water or solvent solution.
As applied, it reacts with the zinc on the galvanized surface and gives a black color.
The resultant blackened surface will therefore be satisfactorily treated to ensure that the surface will be ready for painting.

Mordant Solution for Galvanized Surfaces

Galvanized metal properly prepared using a mordant solution, especially when dealing with new galvanization. Weathered surfaces, however, might require a step to remove white rust before applying the mordant solution.

Steps in Applying the Solution

Cleaning the Surface: Degrease the surface by removing oils and greases.
Apply Mordant Solution: Brush or spray the solution uniformly on the surface.
Color Change Confirmation: Look for the color change from grey to black.
Rinse: Clean the surface with water to remove residue and let it dry completely before priming.

Precautions:

Avoid puddling or excessive accumulation of T wash.
Use solutions formulated for tropical climates in hot weather to prevent premature drying.

Types of Primers After Mordant Solution

T Wash Primer – Galvanized Metal Primer

T wash primer is a tie-coat applied over galvanized surfaces after pre-treatment. It provides a protective layer for effective adhesion.

Etch Primer vs T Wash

Etch primer is regarded as a better option than T wash since it can provide assured strong adhesion. This type of primer is usually used in industrial applications with proper application methods.

Mordant Solution Dulux and Iron Mordant Solution:

Dulux and other manufacturers have mordant solutions for different uses. Another variation is iron mordant solution used for some metal treatments.

Mordant Solution Dulux

Dulux gives the best mordant solutions for galvanized surfaces. Always follow the instructions of the manufacturer for better results.

Cold Phosphate Pre-treatment

In certain situations, it is advisable to perform cold phosphate pre-treatment before applying mordant solutions or primers. The procedure improves adhesion and readies the surface for subsequent coatings.

Conclusion

Mordant solution, including T wash, is a classic reliable pre-treatment of galvanized surfaces. Etch primers are deemed to be better for definite adhesion. However, T wash remains an economical and realistic means of preparing new galvanized metals. Right application guarantees a durable long-lasting coating system.

You will obtain excellent results in surface preparation and painting if you understand what the purpose and application of mordant solutions is.