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Molten salt electroplating preparation method of iridium coating with non-columnar grain structure

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 effect of low raw material cost, low cost and smooth surface

Active Publication Date: 2016-06-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reverse current electroplating process [SaltykovaNAetal.EffectsofCurrentReversalontheStructureofIridiumDepositsObtainedbyMolten-ChlorideElectrolysis.SovietElectrochemistry.1990;26:338-342], but still can not change its columnar crystal structure

Method used

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  • Molten salt electroplating preparation method of iridium coating with non-columnar grain structure
  • Molten salt electroplating preparation method of iridium coating with non-columnar grain structure
  • Molten salt electroplating preparation method of iridium coating with non-columnar grain structure

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Effect test

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 molten salt electroplating preparation method of an iridium coating with a non-columnar grain structure. The preparation method comprises preparing NaCl-KCl-CsCl-IrCl3 mixed salt, taking a plated piece and performing conventional treatment to obtain a plated piece substrate, heating the NaCl-KCl-CsCl-IrCl3 mixed salt into NaCl-KCl-CsCl-IrCl3 molten salt, and then The substrate of the plated part is used as the cathode, which is inserted into the NaCl-KCl-CsCl-IrCl3 molten salt together with the anode, and pulsed molten salt electroplating is performed to obtain a plated part coated with an iridium coating with a non-columnar crystal structure. The preparation method of the invention is efficient, fast and low in cost, and the prepared iridium coating with non-columnar crystal structure has the advantages of smooth surface, compactness, strong oxidation resistance 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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Patent Type & Authority Patents(China)
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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