steel structure anti-corrosion paint construction technology

Table of Contents

1.Causes of Yellowing in High-Temperature Paint

  1. High air humidity.
  2. Excessively high temperatures causing overreaction.
  3. Direct exposure to ultraviolet light.
  4. The paint itself has a low resistance to yellowing.

2. Causes of Sagging in High-Temperature Paint

  1. The surface of the object being painted is too smooth.
  2. Incorrect operation, such as using a spray gun with a nozzle that is too large.
  3. The coating is too thick; it is recommended to apply multiple thin layers.
  4. The paint is too diluted.

3. Causes of Cracking in High-Temperature Paint

  1. The coating is too thick.
  2. The paint is expired.
  3. The topcoat has a low solid content, there may be issues with the resin or the external environment.
  4. The accelerator content is too high.
  5. The paint is too thick, and the paint itself is hard and brittle.

4. Causes of Bubbling in High-Temperature Paint

  1. The thinner and hardener are incompatible.
  2. The object being painted contains moisture.
  3. High air humidity.
  4. Uneven stirring.
  5. Uneven surface.
  6. The paint contains moisture or oil stains.

5. Causes of Whitening in High-Temperature Paint

  1. The solvent has insufficient dissolving power.
  2. Excessively high moisture concentration.
  3. The substrate has a high moisture content.

6. Causes of Layer Peeling in High-Temperature Paint

  1. Incompatible primer and topcoat.
  2. The primer is applied too thickly.
  3. The topcoat is applied before the primer has fully dried.

7. Causes of Sandpaper Marks in High-Temperature Paint

  1. Sanding was not done along the wood grain.
  2. The sandpaper grit is too coarse, and sanding was done before drying.

8.Causes of Oiling in High-Temperature Paint

  1. The object being painted has oil residue or wax.
  2. The paint contains water or oil residue.
  3. The paint viscosity is either too high or too low.

9. Causes of Granulation in High-Temperature Paint

  1. The paint contains impurities and has not been filtered.
  2. There is too much dust or foreign objects.
  3. The paint was not stirred evenly or thoroughly mixed.
  4. The thinner is incompatible and does not dissolve the base material.
  5. Non-standard spraying techniques.

10. Causes of Rough Surface in High-Temperature Paint

  1. The paint itself lacks sufficient fineness, or the surface of the object is dirty.
  2. The working environment is too dirty and not clean enough.
  3. Insufficient coating.

11. Causes of Peeling in High-Temperature Paint

  1. No sealing oil was applied.
  2. The topcoat was applied before the primer had dried.
  3. The surface of the object contains too much moisture.
  4. Incompatible primer and topcoat.

12. Causes of Wrinkling in High-Temperature Paint

  1. Too much hardener was added, causing the paint to dry too quickly.
  2. Inconsistent drying speed between the primer and topcoat.
  3. The nozzle is not properly adjusted.
  4. The coating is too thick, and the viscosity is too high.

13. Causes of Poor Coverage in High-Temperature Paint

  1. The coating is too thin, or spraying is uneven, causing the primer to be visible through the topcoat.
  2. Low coverage and excessive sanding.

14. Causes of Orange Peel in High-Temperature Paint

  1. Poor leveling properties.
  2. Too much or incompatible thinner.
  3. Uneven or poorly prepared substrate.
  4. Low temperature.

15. Causes of Sticky Surface in High-Temperature Paint

  1. The solvent has poor dissolving power, or the air humidity is high.
  2. The coating has not dried, is too thick, or lacks sufficient accelerator.

16. Causes of Pinholes in High-Temperature Paint

  1. Contamination from oil or moisture.
  2. Air trapped inside the paint due to uneven stirring.
  3. Uneven surface of the object being painted.
  4. The paint was applied too thickly, causing poor solvent evaporation.

Color Limitations of High-Temperature Paint

In general, high-temperature paint has many color limitations, unlike other types of paint where any color can be formulated. This is because most pigments cannot maintain their properties at high temperatures, leading to discoloration or blackening. For example:

– Titanium dioxide has excellent thermal stability, retaining its color up to 350–400°C, turning yellow-brown at 600°C, and becoming irreversibly black-brown at 1200–1300°C.

– Red pigment (iron oxide red) is suitable for long-term heat resistance at 250°C.

– Yellow pigments (strontium yellow and cadmium yellow) can only withstand temperatures up to 200°C for extended periods.

– Blue pigment (phthalocyanine blue) is heat-resistant below 200°C.

– Green pigments (Cr₂O₃ and cobalt green)** are suitable for long-term heat resistance at 250°C.

-Aluminum powder has a melting point of about 600°C, commonly used to prepare high-temperature paints that withstand 500–600°C (aluminum color).

– Zinc powder has a melting point of about 420°C, often used to prepare high-temperature paints that withstand 400°C.

Note: The above content is compiled from online sources. If there are any copyright infringements, please contact us for removal!

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