Cold spray zinc is a single-component, high-solids, heavy-duty anticorrosion coating composed of special fusion agents, zinc powder, auxiliaries, and solvents. It can achieve a zinc protective layer with a zinc content of over 96% under normal temperature conditions, with excellent rust prevention performance, excellent weather resistance, strong adhesion, good recoatability, convenient construction, and environmental safety.

Design Purpose:

Used for long-term corrosion protection of steel. It can be used as a single layer or coated with a matching heavy-duty anticorrosion coating to achieve synergistic effects and meet various protection requirements. It is a material for replacing or repairing hot-dip galvanizing and hot-spray galvanizing layers.

Physical Parameters ：

Construction Notes

1. Steel Structure Surface Treatment Requirements

1.1. Cleanliness: Sandblasting or shot blasting to Sa2.5 according to ISO85011 standard or GB892388 national standard, and painting within 2 hours;

1.2. Roughness: Rz approximately 50-70μm;

1.3. On-site welding areas should be manually polished to remove rust to St3 or St2 grade.

2. Cold Spray Zinc Coating Construction Notes:

2.1. Thorough Stirring: For the first time, use an electric stirrer to stir for more than 3 minutes, then use a special accessory (as shown below) to stir the settled zinc powder at the bottom of the bucket twice, and then stir again with an electric stirrer to ensure that there is no settling at the bottom of the bucket. For brush (roller) coating, stir every 30-60 minutes; for air spraying, stir while spraying.

2.2. Thinner and Tool Cleaner: Use the matching thinner as required.

2.3. Coating Method: Brush (roller) coating, air (airless) spraying, dipping

2.4. It is recommended to pre-brush coat the welded parts of the steel structure with cold spray zinc to approximately 40μm.

3. Cold Spray Zinc Coating Construction Environment and Conditions:

3.1. Construction Environment Temperature: 5℃~+50℃

3.2. Construction Environment Relative Humidity: Relative humidity less than 85% is acceptable for coating.

3.3. Steel Surface Temperature: Surface temperature below 60℃, above the dew point by 3℃, surface free of water and ice.

3.4. Recoating Interval: 24 hours

3.5. Long Coating Interval for Cold Spray Zinc: Unlimited

3.6. Coating other matching coatings on the cold spray zinc layer after 24-48 hours (depending on the drying condition of the cold spray zinc surface)

3.7. Spraying Equipment: Must be cleaned with a special thinner for cold spray zinc before and after each construction.

4. Cold Spray Zinc Matching Use ：

4.1. Hot-dip Galvanizing Effect Matching: Cold spray zinc + silver sealant

4.2. Cold Spray Zinc Composite Coating: Cold spray zinc + epoxy iron oxide + polyurethane topcoat

5. Cold Spray Zinc Coating Quality Inspection:

5.1. Check whether the cold spray zinc coating is thoroughly stirred during construction and whether the special thinner for cold spray zinc is used.

5.2. Coating Appearance Quality: The steel structure surface should not be mis-coated or missed; the coating should not peel or rust. The coating is uniform, and all results are visually inspected.

5.3. Coating Adhesion Inspection: The adhesion inspection method is determined by the cross-cut method according to the national GB9286 standard, and the adhesion ≤1 grade.

5.4. Coating Dry Film Thickness Inspection: Use a dry film magnetic thickness gauge to detect the total dry film thickness of the cold spray zinc coating. It is required that the dry film thickness of the coating after the detection of more than 85% of the detection points ≥ the design thickness value, and the dry film thickness of other detection points ≥ 85% of the design thickness value.