Metallographic phase corrosive liquid for austenitic stainless steel as well as preparation and corrosion methods thereof

A technology of austenitic stainless steel and corrosive solution, which is applied in the field of metallographic corrosive solution of austenitic stainless steel and its preparation and corrosion. It can solve the problems of unknown corrosion effect, unsatisfactory corrosion effect, and poor stability of corrosive solution. The effect of corrosion time is easy to grasp, difficult to observe, and corrosion speed is slow

Active Publication Date: 2018-08-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of aqua regia corrosion on austenitic stainless steel depends on the processing state of the alloy. The corrosion effect on the cast and annealed products is good, but the corrosion effect on the cold-worked state is not ideal, and the grain boundary is not obvious.
And the corrosion process has extremely high requirements on the operator's operation process, the corrosion time is short, the grain boundary is not obvious, the corrosion time is slightly longer, the grain boundary becomes coarse and blurred; and the aqua regia corrosion solution must be used after 24 hours after

Method used

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  • Metallographic phase corrosive liquid for austenitic stainless steel as well as preparation and corrosion methods thereof
  • Metallographic phase corrosive liquid for austenitic stainless steel as well as preparation and corrosion methods thereof
  • Metallographic phase corrosive liquid for austenitic stainless steel as well as preparation and corrosion methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The metallographic etching solution of this embodiment is 1ml boric acid, 14ml nitric acid, 8ml hydrofluoric acid and 77ml distilled water.

[0050] Pour an appropriate amount of soft tap water or distilled water into a 500mL rough-mouthed plastic bottle, then add anhydrous sodium carbonate and stir until saturated and dissolved to prepare a saturated alkaline neutralizing solution. Seal the prepared saturated lye with a lid for later use.

[0051] Sample: A new type of high-temperature fatigue-resistant austenitic stainless steel (commercially available), whose composition is based on ordinary 304L with 0.35% Cu, 0.15Mo, 0.03Nb, and 0.25Co added.

[0052] Sample treatment: Grind the test surface of the sample with 180#, 600#, 800#, 1000#, 1200# water sandpaper in turn, and then polish it to a mirror surface without scratches, then rinse it with clean water, spray it with absolute ethanol and dry it.

[0053] Corrosion solution preparation: at room temperature, pour 77...

Embodiment 2

[0057] The metallographic etching solution of this embodiment is 1ml boric acid, 15ml nitric acid, 7ml hydrofluoric acid and 77ml distilled water.

[0058] Pour an appropriate amount of soft tap water or distilled water into a 500mL rough-mouthed plastic bottle, then add anhydrous sodium carbonate and stir until saturated and dissolved to prepare a saturated alkaline neutralizing solution. Seal the prepared saturated lye with a lid for later use.

[0059] Corrosion solution preparation: at room temperature, pour 77ml of distilled water into a beaker, pour 7ml of hydrofluoric acid, 15ml of concentrated nitric acid and 1ml of boric acid into the beaker in turn, stir gently with a stirring rod, then let it stand for 2 minutes to configure as described Metallographic etchant.

[0060] Sample: 3.5mm new high-temperature fatigue-resistant austenitic stainless steel, whose composition is based on ordinary 304L with 0.25% Cu, 0.16Mo, 0.04Nb, 0.25Co added. Sample treatment: Grind the...

Embodiment 3

[0064] The metallographic etching solution of this embodiment is 2ml boric acid, 14ml nitric acid, 7ml hydrofluoric acid and 77ml distilled water.

[0065] Pour an appropriate amount of soft tap water or distilled water into a 500mL rough-mouthed plastic bottle, then add anhydrous sodium carbonate and stir until saturated and dissolved to prepare a saturated alkaline neutralizing solution. Seal the prepared saturated lye with a lid for later use.

[0066] Sample: 2mm solution-treated new high-temperature fatigue-resistant austenitic stainless steel cold-rolled steel plate, whose composition is based on ordinary 304L with 0.25% Cu, 0.16Mo, 0.04Nb, 0.25Co added.

[0067] Sample treatment: Grind the test surface of the sample with 180#, 600#, 800#, 1000#, 1200# water sandpaper in turn, and then polish it to a mirror surface without scratches, then rinse it with clean water, spray it with absolute ethanol and dry it.

[0068] Corrosion solution preparation: at room temperature, p...

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Abstract

The invention provides a novel metallographic phase corrosive liquid for high temperature resistance and fatigue resistance 304 austenitic stainless steel. The metallographic phase corrosive liquid ischaracterized by being prepared from the following raw materials in percentage by mass: 7-9 percent of hydrofluoric acid, 12-16 percent of concentrated nitric acid, 1-2 percent of boracic acid and the balance of distilled water, wherein the mass concentration of the hydrofluoric acid is 40 percent, the mass concentration of the nitric acid is 60-65 percent, and the mass concentration of the boracic acid is 1-3 percent. The corrosive liquid is simple in preparation, convenient in operation of corrosion method, small in pollution and good in stability and reproducibility and can rapidly, uniformly and clearly display a metallographic structure; and a corrosion method is simple in step, convenient to operate and strong in practicability.

Description

technical field [0001] The invention belongs to the field of metallographic corrosion of austenitic stainless steel, in particular to a metallographic corrosion solution for austenitic stainless steel containing molybdenum, copper, niobium and cobalt in its components and a preparation and corrosion method thereof. Background technique [0002] Stainless steel is divided into three categories according to its metallographic structure: austenitic stainless steel, ferritic stainless steel, and martensitic stainless steel. Among them, austenitic stainless steel accounts for the largest proportion, and its output accounts for 70% of the output of stainless steel, so it is widely used. In the research and application of austenitic stainless steel, it is often necessary to analyze its structure type, and adjust its composition, processing and heat treatment process in time according to the structure analysis results. However, in terms of the corrosion of metallographic samples, m...

Claims

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Application Information

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IPC IPC(8): C23F1/28
CPCC23F1/28
Inventor 夏佃秀温道胜王守仁张晓东杨丽颖杜恒科杨学锋王砚军王俊海颜新宇
Owner UNIV OF JINAN
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