Metallographic corrosive agent and method for nickel-vanadium alloy

A nickel-vanadium alloy and metallographic corrosion technology, which is applied in the field of metallographic corrosion, can solve the problems of difficult identification of precipitated phase, observation of metallographic structure and identification of adverse effects, blurred observation surface, etc., and achieve the effect of efficient corrosion

Inactive Publication Date: 2016-01-20
光洋新材料科技(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 1 When using the nickel-vanadium alloy metallographic etchant mentioned above to corrode nickel-vanadium alloy, a film-like contami

Method used

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  • Metallographic corrosive agent and method for nickel-vanadium alloy
  • Metallographic corrosive agent and method for nickel-vanadium alloy
  • Metallographic corrosive agent and method for nickel-vanadium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] ① First add 10L of 30wt% hydrogen peroxide to the container, then add 10L of 68wt% nitric acid and 80L of 36% hydrochloric acid in sequence, stir and let it stand for 10 minutes to obtain the corrosion solution;

[0034] ②Heating the corrosive agent obtained in step ① to 90°C and keeping it warm;

[0035] ③Immerse the polished nickel-vanadium alloy sample completely in the corrosion solution once, and take it out after 10s;

[0036] ④ Rinse the sample taken out with water for 1 min;

[0037] ⑤ Wipe the washed sample with alcohol cotton and let it dry naturally to obtain sample A.

Embodiment 2

[0039] ① First add 15L of 50wt% hydrogen peroxide to the container, then add 15L of 65wt% nitric acid and 70L of 38% hydrochloric acid in sequence, stir and let it stand for 12 minutes to obtain the corrosion solution;

[0040] ②Heating the corrosive agent obtained in step ① to 88°C and keeping it warm;

[0041] ③ Completely immerse the polished nickel-vanadium alloy sample in the corrosion solution for 2 times, each time for 20s, and take it out;

[0042] ④ Rinse the sample taken out with water for 2 minutes;

[0043] ⑤Wipe the washed sample with alcohol cotton and dry it with an air gun to obtain sample B.

Embodiment 3

[0045] ① First add 12.5L of 30wt% hydrogen peroxide to the container, then add 12.5L of 67wt% nitric acid and 75L of 37% hydrochloric acid in sequence, stir and let it stand for 10 minutes to obtain the corrosion solution;

[0046] ②Heating the corrosive agent obtained in step ① to 90°C and keeping it warm;

[0047] ③ Completely immerse the polished nickel-vanadium alloy sample in the corrosion solution for 2 times, each time for 15s, and take it out;

[0048] ④ Rinse the sample taken out with water for 1.5 minutes;

[0049] ⑤ Wipe the washed sample with alcohol cotton and dry it with an air gun to obtain sample C.

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Abstract

The invention belongs to metallographic corrosion technologies, and relates to a metallographic corrosive agent and method for nickel-vanadium alloy. The metallographic corrosive agent for the nickel-vanadium alloy comprises, by volume, 10-15% of hydrogen peroxide of 30-50 wt%, 10-15% of nitric acid of 65-68 wt%, and 70-80% of hydrochloric acid of 36-38 wt%. The metallographic corrosive method includes the steps of blending, heating, soaking, washing, wiping, drying and the like. By means of the metallographic corrosive agent and method, crystalline phases in the nickel-vanadium alloy can be easily distinguished, and the quality of nickel-vanadium alloy products can be easily evaluated. Moreover, the metallographic corrosive agent for the nickel-vanadium alloy can prevent a pollution layer from being formed on the surface of a sample, and prevent the crystalline phases in the nickel-vanadium alloy from being badly corroded. Meanwhile, the corrosive liquid can corrode out the metallographic structure of the sample rapidly and efficiently.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion, in particular to a metallographic etchant and a metallographic corrosion method for making grain boundaries in the metallographic structure of nickel-vanadium alloys clear and easy to distinguish. Background technique [0002] Nickel-vanadium alloy materials are used in aerospace, energy, petrochemical industries, or special electronics / optoelectronics and other fields. The main characteristics are: maintaining good mechanical strength at extremely high temperature, good resistance to high temperature oxidation and high temperature vulcanization, and corrosion resistance to aqueous solutions (acid, alkali, chloride ions). [0003] In the research process of nickel-vanadium alloys, the difference in material composition and the difference in processing and heat treatment often lead to different types of metallographic structures, and thus the properties of the alloys are also diff...

Claims

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Application Information

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IPC IPC(8): C23F1/28
Inventor 马一峰樊凡黄军浩
Owner 光洋新材料科技(昆山)有限公司
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