Pretreatment process suitable for hot aluminum spraying on surface of steel plate and detection method

An inspection method and pretreatment technology, applied in spray guns, manufacturing tools, metal processing equipment, etc., can solve the problems of corrosion at the joint of the coating and residues on the surface, and achieve the effect of improving the bonding strength and strong pinning effect.

Pending Publication Date: 2021-11-05
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above method, the final bonding strength is generally 18±5MPa. However, due to the different sandblasting media, although the roughness can reach the standard, it is easy to leave residue on the surface or cause cold welding behavior to cause adverse effects such as corrosion of the coating joint.

Method used

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  • Pretreatment process suitable for hot aluminum spraying on surface of steel plate and detection method
  • Pretreatment process suitable for hot aluminum spraying on surface of steel plate and detection method
  • Pretreatment process suitable for hot aluminum spraying on surface of steel plate and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Pretreatment and inspection of Q235 steel plate before thermal spraying aluminum.

[0026] (1) The pretreatment method of sandblasting is adopted, and the sandblasting medium is angular alumina particles, and the particle size is 1mm;

[0027] (2) The sandblasting equipment is Shenzhen Jiecheng automatic sandblasting equipment: JIC 1212A, equipped with compressed air, and the pressure of the compressed air is maintained at 0.8MPa during the sandblasting and purging process;

[0028] (3) When sandblasting, the spray gun is 20mm away from the surface to be sandblasted, and the horizontal plane of the surface to be sandblasted is 45°, the sandblasting speed is 20cm / min, and the surface color after sandblasting is uniform off-white;

[0029] (4) After sandblasting, use compressed air to blow, the compressed air outlet is 90° to the horizontal plane of the surface after sandblasting, and blow to the surface without dust;

[0030] (5) For impurity detection on the surface of...

Embodiment 2

[0037] Pretreatment and inspection of Q345 steel plate before thermal spraying aluminum.

[0038] (1) The pretreatment method of sandblasting is adopted, and the sandblasting medium is angular alumina particles with a particle size of 1.5mm;

[0039] (2) The sandblasting equipment is Shenzhen Jiecheng automatic sandblasting equipment: JIC 1212A, equipped with compressed air, and the pressure of the compressed air is maintained at 1.2MPa during the sandblasting and purging process;

[0040] (3) When sandblasting, the spray gun is 30mm away from the surface to be sandblasted, 60° to the horizontal plane of the surface to be sandblasted, the sandblasting speed is 25cm / min, and the surface color after sanding is uniform off-white:

[0041] (4) After sandblasting, use compressed air to blow, the compressed air outlet is 90° to the horizontal plane of the surface after sandblasting, and blow to the surface without dust;

[0042] (5) For impurity detection on the surface of the pret...

Embodiment 3

[0049] Pretreatment and inspection of Q235 steel plate before thermal spraying aluminum.

[0050] (1) The pretreatment method of sandblasting is adopted, and the sandblasting medium is angular alumina particles with a particle size of 1.2mm;

[0051] (2) The sandblasting equipment is Shenzhen Jiecheng automatic sandblasting equipment: JIC 1212A, equipped with compressed air, and the pressure of the compressed air is maintained at 1MPa during the sandblasting and purging process;

[0052] (3) When sandblasting, the spray gun is 22mm away from the surface to be sandblasted, and the horizontal plane of the surface to be sandblasted is 55°, the sandblasting speed is 22cm / min, and the surface color after sandblasting is uniform off-white;

[0053] (4) After sandblasting, use compressed air to blow, the compressed air outlet is 90° to the horizontal plane of the surface after sandblasting, and blow to the surface without dust;

[0054] (5) For impurity detection on the surface of t...

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Abstract

The invention discloses a pretreatment process suitable for hot aluminum spraying on the surface of a steel plate. The pretreatment process comprises the following steps that a sand blasting pretreatment mode is adopted, during sand blasting, a spray gun is 20-30 mm away from the surface to be subjected to sand blasting, an angle of 45-60 degrees is formed between the spray gun and the horizontal plane of the surface to be subjected to sand blasting, and the sand blasting speed is 20-25 cm / min until the surface to be subjected to sand blasting is uniformly grey white; and after sand blasting is finished, the horizontal plane of the sand-blasted surface is blown at 90 degrees until no dust exists on the surface. The invention further discloses a detection method of the pretreated steel plate. By means of the pretreatment and detection method, the standard roughness requirement that Ra is larger than 6 micrometers is met, and the bonding strength of the coating is effectively improved to 23 + / -5 Mpa.

Description

technical field [0001] The invention belongs to the technical field of surface protection of iron and steel materials, and in particular relates to a pretreatment process and inspection method suitable for thermal spraying aluminum on the surface of steel plates. Background technique [0002] The thermal sprayed aluminum technology uses aluminum as the main raw material for consumption, and the available resources are abundant, and because of the simple production process, the thermal sprayed aluminum coating produced has better corrosion resistance than paint, has a long service life, and has little environmental pollution. It is an important technology for steel plate surface corrosion resistance protection. Many domestic and foreign industrial companies have adopted this technology as a means of corrosion protection for long service life of steel structure engineering. [0003] The most important inspection index for the quality of the thermal sprayed aluminum coating on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C1/08B24C5/02B24C7/00
CPCB24C1/086B24C5/02B24C7/0061
Inventor 李伟李松陶镳杨文秀
Owner NANJING IRON & STEEL CO LTD
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