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A method and device for improving corrosion resistance of stainless steel welds

A corrosion-resistant, stainless steel technology, applied in metal material coating process, coating and other directions to achieve the effect of improving corrosion resistance and corrosion resistance

Inactive Publication Date: 2015-07-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No reports have been found on improving the corrosion resistance of stainless steel welds by injecting metal corrosion inhibitor particles through laser melting combined with laser shock strengthening

Method used

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  • A method and device for improving corrosion resistance of stainless steel welds
  • A method and device for improving corrosion resistance of stainless steel welds
  • A method and device for improving corrosion resistance of stainless steel welds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The device of the present invention is as figure 1 , including laser melting injection unit, laser shock strengthening unit, computer control system and numerical control working system. The laser melting injection unit includes a carbon dioxide laser 4, a total reflection mirror 5, a transmission mirror 6, an argon protection device 3, a powder feeder 2 and a powder feeding nozzle 7; the laser shock strengthening unit includes a nanosecond laser 16, a total reflection mirror 15, a transmission Mirror 14; the CNC work system includes a three-axis CNC workbench 11 and a clamping device 10.

[0031] The computer control device 1 controls the three-axis numerical control workbench 11, the nanosecond laser 3, the powder feeder and the carbon dioxide laser 12, respectively completes the injection of metal corrosion inhibitor particles and laser shock strengthening into the stainless steel weld seam. The spot diameters of the continuous laser 8 and the pulsed laser 13 are ad...

Embodiment 2

[0035] The specific steps for implementing a method for improving the corrosion resistance of stainless steel welds are:

[0036] (1) First, the surface of the AISI304 stainless steel weldment 9 to be treated is ground and polished to a surface roughness of Ra1.6, then cleaned and dried with acetone, and the treated stainless steel weldment 9 is placed on a three-axis CNC work on stage 11;

[0037] (2) Select 20nm potassium magnesium phosphate particles, put the potassium magnesium phosphate particles into the powder feeder 2, adjust the angle between the powder feed nozzle 7 and the surface normal of the stainless steel welded part 9, so that the continuous laser 8 is on the stainless steel weld seam. The distance between the spot position and the position where potassium magnesium phosphate particles are injected into the molten pool is 5mm;

[0038](3) DL-HL-T5000 carbon dioxide laser 4 is used, the preset power is 3kw, the laser mode is TEM00, the spot diameter is 1mm, an...

Embodiment 3

[0043] The parameters of the nanosecond laser 16 in Example 2 are changed to a pulse energy of 10 J, a spot radius of 3 mm, a pulse width of 20 ns and a repetition rate of 15 Hz; parameters of the carbon dioxide laser 4 are changed to a spot diameter of 3 mm, a laser power of 5 kw, and scanning The speed is 0.6m / min and the powder feeding speed is 100mg / s; the metal corrosion inhibitor particles are 35nm sodium magnesium phosphate; the thickness of the anti-corrosion layer after polishing is 0.3mm.

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Abstract

The invention discloses a method and a device for improving the corrosion resistance of stainless steel weld seams. The method comprises the following steps of: firstly, preparing a kind of nanoscale metal corrosion inhibitor particles; then, injecting the nanoscale metal corrosion inhibitor particles into stainless steel weld seams by using a carbon dioxide laser so as to form an anti-corrosion layer; and finally, carrying out shock strengthening treatment on the surfaces of the stainless steel weld seams by using a nanosecond laser, so that a high-amplitude residual compressive stress layer with a certain depth is formed at a stainless steel weld seams area. The device for implementing the method comprises a computer control system, a powder feeder, an argon gas protection device, the carbon dioxide laser, an omni-directional reflector, a transmitting mirror, a powder feeding nozzle, a stainless steel welding part, a clamping device, a three-axis numerical control workbench, a flexible attaching film and the nanosecond laser. According to the invention, the corrosion sensitivity of the stainless steel weld seams in a corrosive environment can be greatly reduced, and the service life of the stainless steel weld seams can be prolonged, therefore, the method and device disclosed by the invention are applicable to the improvement of the corrosion resistance of various stainless steel weld seams, and also can be expanded to the improvement of the corrosion resistance of weld seams of aluminum alloys and titanium alloys and the like.

Description

technical field [0001] The invention relates to the field of improving metal surface properties, in particular to a technology for improving the corrosion resistance of stainless steel weld seams. Background technique [0002] Stainless steel welded parts are widely used in chemical, coastal, petrochemical and other fields due to their good mechanical properties and low price. However, stainless steel welded parts are prone to intergranular corrosion, pitting corrosion and stress corrosion cracking at welded joints, which seriously restricts The application of stainless steel weldments in corrosive environments. Therefore, improving the corrosion resistance of welds has become an urgent problem to be solved. In order to improve the corrosion resistance of stainless steel welds, a lot of research has been carried out at home and abroad, among which laser shock strengthening, as an emerging technology, is widely used to improve the corrosion resistance of stainless steel weld...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C24/10C21D1/09
Inventor 鲁金忠齐晗罗密王志龙
Owner JIANGSU UNIV
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