Steel Parts Coating Pre-treatment in Vietnam: The Silane Revolution 

In Vietnam’s booming manufacturing sector, steel remains the dominant material for racking systems, electrical cabinets, automotive frames, and machinery. However, foreign-invested coating enterprises face a dual pressure: the harsh tropical climate (high humidity causing rust) and strict regulations from MONRE regarding sludge disposal from traditional Phosphating processes.

How can you improve paint adhesion and salt spray resistance while ensuring environmental compliance and reducing energy costs? Hongyi New Materials recommends a modernized pre-treatment solution featuring LQ-F100 Spraying Alkaline Degreaser and LQ-F801 Nano-silane Agent.

The Challenge: Limitations of Traditional Phosphating in Vietnam

Zinc or Iron Phosphating used to be the industry standard. However, in Vietnam’s current industrial landscape, its drawbacks are becoming critical:

1. High Hazardous Waste Costs: Phosphating inevitably generates large amounts of sludge. Disposal costs for this solid waste are rising annually in Vietnam.

2. High Energy Consumption: Phosphating typically requires heating to 40-60°C, consuming significant electricity or gas.

3. Wastewater Risks: Phosphorus-containing wastewater is difficult to treat. Exceeding discharge limits can lead to heavy fines or production shutdowns.

Hongyi’s Steel Parts Coating Solution: The Eco-Friendly “Degreasing + Silane” Two-Step Process

We have tailored a high-efficiency solution specifically for automated spraying lines (Powder Coating/Wet Paint), ideal for large-scale factories in Haiphong, Bac Ninh, and Hai Duong.

Step 1: Steel Parts Coating Powerful Cleaning – LQ-F100 Spraying Alkaline Degreaser

80% of coating failures stem from poor pre-treatment cleaning. Steel parts often carry rust-preventative oils, cutting fluids, and dust from stamping and storage.

Core Advantages of LQ-F100:

• Designed for Spray Lines: A low-foaming formula designed for high-pressure spraying environments. It prevents foam overflow and pump cavitation, ensuring smooth continuous production.

• Superior Decontamination: Contains high-efficiency surfactants and builders that rapidly emulsify and strip heavy oils. Even with stubborn drawing oils, LQ-F100 ensures a “water-break-free” surface, laying a perfect foundation for conversion coating.

• Long-Lasting: High tolerance for oil contamination significantly extends bath life, reducing replacement frequency and wastewater discharge.

Step 2: Technological Revolution – LQ-F801 Nano-silane Agent (Ceramic Conversion)

This is the game-changer replacing traditional phosphating. LQ-F801 utilizes nano-silane technology to form a dense, nano-scale organic-inorganic hybrid film (Ceramic Coating) on the steel surface.

LQ-F801 vs. Traditional Phosphating:

• Zero Sludge, Zero Clogging: The reaction produces absolutely no sludge, eliminating nozzle clogging and the tedious labor of tank cleaning. Equipment uptime is maximized.

• Room Temperature Operation: No heating required. In Vietnam’s hot summers, this not only saves energy costs but also improves the working environment.

• Superior Adhesion & Corrosion Resistance: The silane film forms strong “chemical bonds” between the metal substrate and the paint. Tested with powder coating, it achieves Grade 0 (Perfect) in Cross-hatch adhesion tests and exceeds 500-1000 hours in Neutral Salt Spray (NSS) tests.

• Multi-Metal Capability: LQ-F801 works not just on Steel, but also on Galvanized Iron (GI) and Aluminum, making it perfect for flexible, mixed-production lines.

Why Do Vietnam’s Foreign Coating Factories Choose Hongyi?

1. Lower Total Operational Costs: While the unit price of Silane may be higher than Phosphate, when you factor in zero heating costs, zero sludge disposal fees, and reduced maintenance labor, the Hongyi LQ-F801 solution typically saves 15%-20% in total operating costs.

2. Local Technical Response: Coating pre-treatment requires precise parameter control (pH, Conductivity). Hongyi’s technical team in Northern Vietnam offers 24-hour on-site debugging, assisting in establishing SOPs.

3. Compliance Assurance: Our products are free from Phosphorus, Heavy Metals, and Nitrites, fully complying with RoHS standards. We help you easily pass ISO14001 audits and brand inspections.

Frequently Asked Questions (FAQ)

Q1: Do we need to modify our equipment to switch from Phosphating to LQ-F801 Silane?

A: Generally, no. You simply need to clean the existing phosphating tanks and piping. You can use your existing spray equipment. Since the silane process is shorter, you might even free up tanks for extra water rinsing, further improving quality.

Q2: What color is the film formed by LQ-F801?

A: Unlike the grey/black crystalline film of phosphating, the nano-silane film is extremely thin (20-200nm). It is typically colorless/transparent or has a faint blue/gold hue (depending on light refraction). This invisibility does not affect its superior adhesion properties.

Q3: What is the recommended concentration for LQ-F100 Degreaser?

A: We recommend an initial bath concentration of 3%-5%. It works effectively from room temperature up to 60°C. We will provide specific parameter recommendations based on the oil contamination level of your workpieces.

Looking to Improve Your Steel Parts Coating Solutions?

Contact the Hongyi Engineering Team today for free samples and a bath analysis report.

• Zalo/ Hotline: 0827 626 966
• Address: Nhà Xưởng F.A3, lô CN3-03, Khu phi thuế quan và KCN Nam Đình Vũ (khu 1), thuộc Khu Kinh tế Đình Vũ – Cát Hải, Phường Đông Hải 2, Quận Hải An, Thành phố Hải Phòng, Việt Nam