Electrolytic corrosion method for K640 high-temperature alloy

A high-temperature alloy, electrolytic corrosion technology, applied in the preparation of test samples, etc., can solve problems such as over-corrosion, improve efficiency, solve technical problems of over-corrosion, and simplify the preparation process.

Pending Publication Date: 2021-01-26
JINCHUAN GROUP LIMITED
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, this method can form a passivation layer on the surface during the electrolysis process, which solves the technical problem of over-corrosion of K640 superalloy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrolytic corrosion method for K640 high-temperature alloy
  • Electrolytic corrosion method for K640 high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Grinding and polishing: the K640 superalloy metallographic sample to be corroded was polished for 6 minutes several times with 200 mesh sandpaper.

[0017] Preparation of electrolytic polishing etchant: take H with a volume ratio of 2:3:2.5 3 PO 4 、HNO 3 , and H 2 O is mixed and made to form a homogeneous mixed solution;

[0018] Electrolytic corrosion polishing: Add the prepared electrolyte into the electrolytic cell, turn on the electrolytic polishing corrosion instrument, press the start button, the acid pump circulates upwards, touches the sample, the electrolytic cathode is the unpolished sample surface, and the anode is polished For a good sample surface, the modulation voltage is 0.03V, and the electrolysis time is 5s. It should be noted that the sample must be placed in contact with the liquid surface and in conductive contact with the upper cover screw of the electrolytic cell, otherwise there will be no voltage and current, and the timing must be fixed. Th...

Embodiment 2

[0021] Grinding and polishing: The metallographic sample of the K640 superalloy to be corroded was polished for 4 minutes several times with 350 mesh sandpaper.

[0022] Preparation of electrolytic polishing etchant: take H with a volume ratio of 3:4:3 3 PO 4 、HNO 3 , and H 2 O is mixed and made to form a homogeneous mixed solution;

[0023] Electrolytic corrosion polishing: Add the prepared electrolyte into the electrolytic cell, turn on the electrolytic polishing corrosion instrument, press the start button, the acid pump circulates upwards, touches the sample, the electrolytic cathode is the unpolished sample surface, and the anode is polished For a good sample surface, the modulation voltage is 0.03V, and the electrolysis time is 10s. It should be noted that the sample must be placed in contact with the liquid surface and in conductive contact with the upper cover screw, otherwise there will be no voltage and current, the timing must be fixed, and the sample surface ca...

Embodiment 3

[0026] Grinding and polishing: The metallographic sample of the K640 superalloy to be corroded is polished for 3 minutes several times with 500 mesh sandpaper.

[0027] Preparation of electrolytic polishing etchant: take H with a volume ratio of 4:5:3.5 3 PO 4 、HNO 3 , and H 2 O is mixed and made to form a homogeneous mixed solution;

[0028] Electrolytic corrosion polishing: Add the prepared electrolyte into the electrolytic cell, turn on the electrolytic polishing corrosion instrument, press the start button, the acid pump circulates upwards, touches the sample, the electrolytic cathode is the unpolished sample surface, and the anode is polished For a good sample surface, the modulation voltage is 0.03V, and the electrolysis time is 15s. It should be noted that the sample must be placed in contact with the liquid surface and in conductive contact with the screw on the upper cover, otherwise there will be no voltage and current, and the timing must be fixed, and the sampl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an electrolytic corrosion method for a K640 high-temperature alloy. The electrolytic corrosion method comprises the following steps: (1) grinding and polishing: grinding a to-be-corroded K640 high-temperature alloy metallographic specimen with 180-1000-mesh abrasive paper for 3-6 minutes; (2) preparing an electrolytic polishing corrosive agent, namely mixing H3PO4, HNO3 andH2O in a volume ratio of (2-4): (3-5): (2.5-3.5) to form a uniform mixed solution; (3) electrolytic corrosion polishing in which the prepared electrolytic polishing corrosive agent is added into an electrolytic cell, an electrolytic polishing corrosion instrument is turned on, a start key is pressed, an acid liquid pump circularly surges upwards to make contact with a sample, an electrolytic cathode is a K640 high-temperature alloy metallographic sample, an anode is a ground K640 high-temperature alloy metallographic sample, the modulation voltage is 0.03 V, and the electrolysis time is 5-15s; and (4) metallographic microscopic detection: taking out the corroded metallographic specimen, repeatedly cleaning the metallographic specimen with deionized water and alcohol, and blow-drying themetallographic specimen, so that the corroded metallographic specimen is used for observing a microscopic structure under a microscope.

Description

technical field [0001] The invention belongs to the technical field of K640 high-temperature alloy corrosion, and in particular relates to an electrolytic corrosion method for K640 high-temperature alloy. Background technique [0002] K640 superalloy is usually used as the material of aero-engine turbine guide blades. When the fuel combustion of the engine is insufficient, the flame will move backward, the cooling holes of the blades will be blocked, and the load will increase suddenly, which will lead to the overheating service of the blades. The time of overheating is usually only a few seconds to a few minutes, but it will lead to rapid tissue damage and mechanical performance degradation of the blade material, and even cause the consequences of aircraft crash. In-depth study of microscopic tissue damage. The preparation of metallographic samples is an important prerequisite for the microstructure analysis of turbine blades. The quality of grinding and corrosion of meta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 吴大莉王旭周华张东王江郭锋王雪连张星星徐宁刘长仨
Owner JINCHUAN GROUP LIMITED
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap