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Fused salt electroplating preparation method for non-columnar crystal tissue iridium coating

A non-columnar, molten salt technology, applied in the field of molten salt electrochemistry and surface treatment, can solve the problem of inability to change the columnar crystal structure, and achieve the effects of low cost of raw materials, simple equipment and strong oxidation resistance.

Active Publication Date: 2014-05-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although also tried reverse current electroplating process [Saltykova NA et al. Effects of Current Reversal on the Structure of Iridium Deposits Obtained by Molten-Chloride Electrolysis. Soviet Electrochemistry. 1990; 26: 338-342], but still can not change its columnar crystal structure

Method used

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  • Fused salt electroplating preparation method for non-columnar crystal tissue iridium coating
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  • Fused salt electroplating preparation method for non-columnar crystal tissue iridium coating

Examples

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Embodiment 1

[0034] A kind of molten salt electroplating preparation method of non-columnar structure iridium coating of the present invention, its technical process is as follows figure 1 shown, including the following steps:

[0035] (1) Prepare mixed salt:

[0036] According to the mass percentage, NaCl: 22%, KCl: 28%, CsCl: 40%, IrCl 3 : 10% prepared mixed salt, ground and mixed to get NaCl-KCl-CsCl-IrCl 3 Mix salt.

[0037] (2) Pre-treatment of plating parts:

[0038] The plated parts are made of powder metallurgy rhenium sheet. Before electroplating, the usual methods are used for degreasing, pickling, rust removal, water washing, acetone ultrasonic cleaning (15min), and drying to obtain the powder metallurgy rhenium sheet plating substrate.

[0039] (3) Pulse molten salt electroplating:

[0040] NaCl-KCl-CsCl-IrCl obtained in step (1) 3 Put the mixed salt into the electroplating tank, and heat it from room temperature to the electroplating temperature of 640 °C at a heating ra...

Embodiment 2

[0047] A kind of molten salt electroplating preparation method of non-columnar structure iridium coating of the present invention, its flow process is as follows figure 1 shown, including the following steps:

[0048] (1) Prepare mixed salt:

[0049] According to the mass percentage, NaCl: 15.4%, KCl: 19.6%, CsCl: 60%, IrCl 3 : 5% prepared mixed salt, ground and mixed to get NaCl-KCl-CsCl-IrCl 3 Mix salt.

[0050] (2) Pre-treatment of plating parts:

[0051] The plated piece is a graphite sheet with a rhenium coating. Before electroplating, it is degreased, derusted, washed with water, ultrasonically cleaned with acetone (15min), and dried to obtain a graphite plated piece substrate with a rhenium coating.

[0052] (3) Pulse molten salt electroplating:

[0053] use as figure 2 In the pulse plating device shown, the NaCl-KCl-CsCl-IrCl obtained in step (1) 3 Put the mixed salt into the electroplating tank, and heat it from room temperature to the electroplating temperatu...

Embodiment 3

[0059] A kind of molten salt electroplating preparation method of non-columnar structure iridium coating of the present invention, its technical process is as follows figure 1 shown, including the following steps:

[0060] (1) Prepare mixed salt:

[0061] According to mass percentage, NaCl: 11%, KCl: 14%, CsCl: 65%, IrCl 3 : 10% prepared mixed salt, ground and mixed to get NaCl-KCl-CsCl-IrCl 3 Mix salt.

[0062] (2) Pre-treatment of plating parts:

[0063] The plated parts are made of powder metallurgy molybdenum sheet. Before electroplating, the usual methods are used for degreasing, rust removal, water washing, acetone ultrasonic cleaning (15min), and drying to obtain the powder metallurgy molybdenum sheet plating substrate.

[0064] (3) Pulse molten salt electroplating:

[0065] use as figure 2 In the pulse plating device shown, the NaCl-KCl-CsCl-IrCl obtained in step (1) 3 Put the mixed salt into the electroplating tank, and heat it from room temperature to the ele...

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Abstract

The invention discloses a fused salt electroplating preparation method for a non-columnar crystal tissue iridium coating. The preparation method comprises the following steps: preparing NaCl-KCl-CsCl-IrCl3 mixture salts, performing ordinary treatment on a plated piece to obtain a substrate for plating, heating the NaCl-KCl-CsCl-IrCl3 mixture salts into a NaCl-KCl-CsCl-IrCl3 fused salt, subsequently inserting the substrate for plating as a cathode together with an anode into the NaCl-KCl-CsCl-IrCl3 fused salt, and performing pulse fused salt electroplating to obtain the plated piece plated with the non-columnar crystal tissue iridium coating. The preparation method disclosed by the invention is high in efficiency, high in speed and low in cost, and moreover, the prepared non-columnar crystal tissue iridium coating has the advantages of smooth surface, compact structure, high oxidation resistance property and the like.

Description

technical field [0001] The invention belongs to the technical field of molten salt electrochemistry and surface treatment, and in particular relates to a method for preparing an iridium coating with a non-columnar crystal structure by molten salt electroplating. Background technique [0002] Iridium has a high melting point (2440°C), low saturated vapor pressure, and low oxygen permeability (10 -14 g cm -1 ·s -1 ), so it has excellent high temperature oxidation resistance, and is the only metal that still has good mechanical properties in air above 1600 °C. These outstanding properties determine that iridium has a wide range of uses, especially in high-temperature fields, such as the surface of high-temperature structural parts of missile cruiser turbine engines, automobile engines and other gas turbine engines, and has great potential in high-tech fields such as aviation, aerospace, and navigation. application prospects. Iridium coating is currently the only anti-oxidat...

Claims

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Application Information

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IPC IPC(8): C25D3/66C25D5/18
Inventor 白书欣叶益聪张虹朱利安
Owner NAT UNIV OF DEFENSE TECH
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