Equipment, Powder Coating Lines

Equipment Introduction

The Dip Tank Multi-Station Pretreatment System is a commonly used surface treatment equipment. Its principle is to accelerate chemical reactions through mechanical scrubbing to complete processes such as degreasing, phosphating, and water washing.

The typical process for spray pretreatment of steel parts is: pre-degreasing, degreasing, water washing, water washing, surface conditioning, phosphating, water washing, water washing, and pure water washing.

Pretreatment can also adopt shot blasting cleaning machines, which are suitable for steel parts with simple structures, severe rust, and no or little oil contamination. It also avoids water pollution.

Main Process Objectives of Pretreatment

Provide a clean surface;

Significantly improve the adhesion of the workpiece surface;

Greatly improve the corrosion resistance of the coating film;

Improve the surface smoothness and decorative performance of the workpiece;

Create a good substrate condition for coating application.

Pretreatment Process Flow

Manual Loading

→ Degreasing Spray (40–50℃, 3.0 min)

→ Drip Water Removal

→ Water Washing 1 Spray (RT, 1.0 min)

→ Drip Water Removal

→ Water Washing 2 Spray (RT, 1.0 min)

→ Drip Water Removal

→ Surface Conditioning Spray (RT, 1 min)

→ Drip Water Removal

→ Phosphating Spray (35–45℃, 3 min)

→ Drip Water Removal

→ Water Washing 3 Spray (RT, 1.0 min)

→ Drip Water Removal

→ Water Washing 4 Spray (RT, 1.0 min)

→ Drip Water Removal

→ Moisture Drying (100–120℃, 15 min)

→ Coating Process

Pretreatment Requirements and Configuration

Full spray pretreatment process

The equipment adopts a complete spray treatment process with reasonable production space utilization.

Reverse cleaning method for water washing spray

The water washing spray adopts a reverse cleaning method, which improves cleaning quality while saving water consumption.

Spray chamber design

The top of the spray chamber is equipped with high-temperature-resistant sealing brushes and exhaust devices, which prevent gas leakage and protect the rails and chains from corrosion.

Isolation water baffles are installed between each spray process section to reduce liquid carry-over between different treatment stages.

Product Parameters

Item	Parameter Range
Number of Degreasing Tanks	1–2 tanks
Number of Water Washing Tanks	1–3 tanks
Number of Phosphating Tanks	1 tank
Drying Oven Temperature	80–180℃
Workpiece Size	Customized according to customer products
Production Cycle Time	Designed according to workpiece weight and production capacity
Equipment Length	5m–30m (customizable)
Equipment Width	1m–5m (customizable)

Product Features

The Dip Tank Pretreatment Equipment uses immersion methods to perform surface treatments such as degreasing, cleaning, and phosphating on metal workpieces. It features comprehensive treatment coverage, stable performance, wide applicability, and flexible operation. It can effectively improve the adhesion and corrosion resistance of subsequent coatings.

Main Features:

Comprehensive Treatment Coverage:

Workpieces are completely immersed in treatment solutions, enabling effective treatment of complex structures, grooves, inner holes, and other difficult areas.

Stable Treatment Performance:

Chemical solutions fully contact the workpieces, ensuring uniform degreasing, cleaning, and phosphating results.

Wide Application Range:

Suitable for various products such as automotive parts, hardware products, engineering machinery components, and metal structural parts.

Optional Automation Level:

Automatic conveying systems, PLC control systems, and other configurations can be selected according to requirements to improve production efficiency.

Improved Coating Quality:

Effectively enhances coating adhesion, corrosion resistance, and service life.

Customized Design:

Tank dimensions, treatment processes, and equipment configurations can be customized according to customer products and process requirements.

Product Applications

The Dip Tank Pretreatment Equipment is mainly used for surface treatment before metal workpiece coating. Through immersion processes such as degreasing, cleaning, surface conditioning, phosphating, and rust prevention treatment, it removes oil, oxides, and impurities from the surface, improving the adhesion, corrosion resistance, and service life of subsequent coatings.

Main Application Fields:

Powder Coating Industry

Used for surface pretreatment before powder coating of metal workpieces. It removes oil and impurities and forms a phosphating film to improve powder coating adhesion and corrosion resistance.

Automotive Parts Industry

Used for pretreatment before coating automotive chassis components, frames, springs, fasteners, wheels, and other metal parts.

Hardware Products Industry

Used for cleaning and surface treatment of door and window hardware, metal tools, furniture hardware, construction hardware, and other products.

Engineering Machinery Industry

Used for pretreatment before coating excavator parts, loader components, industrial equipment parts, and large metal structural components.

Home Appliance Manufacturing Industry

Used for surface cleaning and anti-corrosion treatment of metal components such as refrigerator housings, air conditioner parts, washing machine parts, and electrical appliance enclosures.

Metal Structural Components Industry

Used for degreasing, phosphating, and surface treatment of steel structures, equipment housings, mechanical parts, and other products.

FAQ

1. What is the main purpose of dip tank pretreatment equipment?

Dip tank pretreatment equipment is mainly used for surface treatment of metal workpieces before coating. Through immersion processes such as degreasing, cleaning, surface conditioning, and phosphating, it removes oil, oxides, and impurities from workpiece surfaces, improving the adhesion, corrosion resistance, and service life of subsequent coatings.

2. What products are suitable for dip tank pretreatment equipment?

Dip tank pretreatment equipment is suitable for various metal workpieces, including:

Automotive parts (chassis components, springs, fasteners, frames, etc.);

Hardware products;

Engineering machinery parts;

Metal structural components;

Metal housings of home appliances;

Aluminum products and other metal products requiring surface treatment.

3. What treatment processes are available for dip tank pretreatment equipment?

According to product materials and production process requirements, the equipment can be configured with different treatment processes. Common processes include:

Degreasing and oil removal;

Water washing and cleaning;

Surface conditioning;

Phosphating treatment;

Rust prevention treatment;

Drying treatment.

Different process flows can be designed according to customer product characteristics.

4. What are the advantages of dip tank pretreatment equipment?

The main advantages include:

Workpieces are completely immersed in the treatment solution, providing comprehensive treatment coverage;

Effectively treats complex areas such as grooves and holes;

Provides uniform and stable surface treatment results;

Improves coating adhesion and corrosion resistance;

Suitable for metal workpieces of different sizes and shapes;

Enables automated production and improves production efficiency.

5. Can dip tank pretreatment equipment be customized?

Yes. Dip tank pretreatment equipment can be customized according to customer product size, production capacity, and process requirements, including:

Number and dimensions of tanks;

Treatment process flow;

Heating method;

Conveying method;

Automatic control system;

Overall equipment layout, etc.

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