1.Why is it not recommended to use dish soap?
Insufficient Cleaning Ability:
The rolling oils and rust-preventive oils used in industrial galvanized coils (especially those galvanized after cold rolling) are typically high-viscosity, high-adhesion mineral oils or specialized greases.
Dishwashing liquids are primarily designed for cleaning animal and vegetable oils; their emulsification and decomposition capabilities are far from sufficient to completely remove these industrial oil stains.
Easily Leaves Residue:
Dishwashing liquids contain many additives (such as fragrances, pigments, and hand-care ingredients) to provide moisturizing and fragrance effects.
These components are very difficult to rinse thoroughly with water, forming an invisible film on the galvanized sheet surface. This residue can severely affect subsequent processes, such as:
Painting/Spraying: Leading to decreased paint and coating adhesion, resulting in defects such as pinholes, orange peel, and flaking.
Adhesion: Affecting the bonding effect of adhesives.
Potential damage to the zinc plating layer:
Although dishwashing liquid itself is neutral or weakly alkaline and has minimal corrosive effect on the zinc plating layer, improper concentration control or excessive soaking time can cause the surfactants and salts in it to slightly affect the gloss of the zinc plating layer.
More importantly, if rinsing is not thorough, residual dishwashing liquid combined with moisture may form white rust (basic zinc carbonate) on the surface over time.
2.What are the characteristics of specialized cleaning agents?
Powerful emulsification and decomposition: Specifically designed for mineral oils and rolling oils, it quickly and thoroughly removes oil stains.
Low-foaming or non-foaming: Suitable for spray cleaning, facilitating rinsing and process control.
Easy to rinse: Pure formula, free of residues, resulting in a high level of surface cleanliness after rinsing.
Substrate-friendly: Effectively removes contaminants while maximizing the protection of the zinc coating, preventing corrosion or loss of gloss.
Environmentally friendly and safe: Meets industrial wastewater treatment standards.
3.What are the absolutely prohibited uses?
If your galvanized coils require subsequent high-surface-requirement processing such as coating or printing, you must never use detergent.
4.Can it be used in emergency or extremely low-requirement situations?
If it is only a small piece of galvanized sheet used in situations where surface cleanliness requirements are not high (such as internal structural parts), and there is no professional cleaning agent on hand, you can temporarily wipe it with a diluted dish soap solution. Be sure to rinse it thoroughly with plenty of clean water repeatedly, and then wipe it dry with a dry cloth or let it air dry immediately to prevent rusting.
5.Is it necessary to choose a specialized solution for industrial production?
For galvanized coils intended for industrial use, it is essential to use specialized industrial cleaning agents and appropriate cleaning processes. This is the only correct way to ensure product quality and avoid subsequent process failures and economic losses.