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Coloring method for wrought aluminum alloy welded joint color metallography

A technology for deformed aluminum alloys and welded joints, which is applied to measuring devices, instruments, and material analysis through optical means. Weld corrosion and other problems, to achieve the effect of low cost, high accuracy, clear grain boundary

Active Publication Date: 2015-02-18
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the color metallographic weld in the fusion zone of the welded joint of the deformed aluminum alloy sample obtained by this method is severely corroded, and the grain structure of the fusion zone cannot be seen in the prepared photos.

Method used

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  • Coloring method for wrought aluminum alloy welded joint color metallography
  • Coloring method for wrought aluminum alloy welded joint color metallography
  • Coloring method for wrought aluminum alloy welded joint color metallography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Add 0.5 g of potassium chloride, 32 ml of 35% phosphoric acid solution and 10 ml of 37% hydrochloric acid solution into 280 ml of deionized water and mix to obtain an acid etching solution;

[0035] 2) Heat the acid etching solution to 55°C, drop the solution on the surface of the ground and polished welding wire ER4043 filled weld specimen for 60 seconds, rinse with a large amount of deionized water, and dry with hot air;

[0036] 3) Immerse the acid-etched specimen completely in the Weck reagent and shake gently for 5 seconds. After the surface is colored, rinse it with a large amount of deionized water and dry it with hot air.

[0037] Metallographic photographs obtained as figure 1 shown, from figure 1 Clear grain boundaries and grain morphology can be seen in the welding wire ER4043 filled weld.

Embodiment 2

[0039] 1) Add 1.8 g of potassium chloride, 32 ml of 35% phosphoric acid solution and 10 ml of 37% hydrochloric acid solution into 280 ml of deionized water and mix to obtain an acid etching solution;

[0040] 2) Add 1g of NaOH solid to 250ml of deionized water and mix to obtain an alkali etching solution;

[0041] 3) Heat the acid etching solution to 65 ° C, drop the solution on the surface of the ground and polished multi-layer multi-pass welding wire ER5356 filled weld specimen for 60 seconds, rinse with a large amount of deionized water, and dry with hot air;

[0042] 4) Heat the alkaline etching solution to 50°C, immerse the acid-etched specimen in the alkaline etching solution for 100s, rinse with a large amount of deionized water, and dry with hot air;

[0043] 5) Completely immerse the test piece after alkali etching treatment in Weck reagent and shake gently for 10 seconds. After the surface is colored, rinse it with a large amount of deionized water and dry it with ho...

Embodiment 3

[0046] 1) Add 1.2 g of potassium chloride, 25 ml of 35% phosphoric acid solution and 10 ml of 37% hydrochloric acid solution into 280 ml of deionized water and mix to obtain an acid etching solution;

[0047] 2) Add 3g of NaOH solid to 250ml of deionized water and mix to obtain an alkali etching solution;

[0048] 3) Heat the acid etching solution to 60°C, drop the solution on the surface of the heat-affected zone specimen after grinding and polishing the welded 7N01 aluminum alloy for 50 seconds, rinse it with a large amount of deionized water, and dry it with hot air;

[0049] 4) Heat the alkaline etching solution to 40°C, immerse the acid-etched specimen in the alkaline etching solution and vibrate ultrasonically for 60s, rinse with a large amount of deionized water, dry with hot air, and the ultrasonic frequency is 15kHz;

[0050] 5) Completely immerse the test piece after alkali etching treatment in Weck reagent and shake gently for 5 seconds. After the surface is colored...

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Abstract

The invention provides a coloring method for wrought aluminum alloy welded joint color metallography. The method comprises pre-etching and coloring, wherein the pre-etching comprises an acid etching processing step which comprises procedures as follows: an acid etching solution is heated to 55-65 DEG C, dripped on a workpiece surface for 50 s-60 s, flushed by a large amount of deionized water and dried by hot air, and the acid etching solution adopts an aqueous solution comprising 0.3-0.5 mol / L of Cl<->, 1.4-1.8 mol / L of H<+> and 0.3-0.5 mol / L of PO4<3->; and according to the coloring, a test piece after etching processing is soaked in a Weck reagent completely, shaken slightly for 5-10 s, flushed by a large amount of deionized water after surface coloring and dried by hot air. With adoption of the method, the success rate for test piece preparation is high, the repeatability is high, the cost is low, and the wrought aluminum alloy welded joint color metallography processed with the method has the advantages of high contrast display, clear grain boundary and high test result accuracy.

Description

technical field [0001] The invention belongs to the technical field of metal material plating, and in particular relates to a color metallographic coloring method of deformed aluminum alloy welded joints. Background technique [0002] At present, there are many means and methods for detecting the microstructure of materials, such as electron scanning electron microscope, electron transmission electron microscope, electron probe, X-ray flaw detection and high power metallographic microscope, etc., which can be used to detect the microstructure of materials, but each equipment and method of use Each has its own emphasis on the detection parameters. It is very common and effective to use a high-magnification metallographic microscope to observe the microstructure of aluminum alloys, especially the metamorphic effect. Engineers and technicians can predict and judge the performance of metals by observing and analyzing high-power imaging, and analyze various failures and damages. ...

Claims

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Application Information

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IPC IPC(8): G01N1/30G01N1/32
CPCC23F1/20C23F1/36G01N1/32G01N1/30G01N21/255
Inventor 路浩邢立伟韩德成
Owner CRRC QINGDAO SIFANG CO LTD
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