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Corrosion inhibitor-based anodic oxidation electrolyte and oxidation process for iron-chromium-aluminum alloy

An iron-chromium-aluminum alloy and anodic oxidation technology, which is applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems that cannot meet the actual production needs and the corrosion resistance of the alloy is limited, and achieve short anodic oxidation time, Easy access and simple solution ratio

Inactive Publication Date: 2019-10-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Common anodizing processes include sulfuric acid anodizing, oxalic acid anodizing and sodium hydroxide anodizing, but the corrosion resistance of the alloy is limited and cannot meet the actual production needs, and the existing anodizing process is based on adding corrosion inhibitors agent can greatly improve the corrosion resistance

Method used

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  • Corrosion inhibitor-based anodic oxidation electrolyte and oxidation process for iron-chromium-aluminum alloy
  • Corrosion inhibitor-based anodic oxidation electrolyte and oxidation process for iron-chromium-aluminum alloy
  • Corrosion inhibitor-based anodic oxidation electrolyte and oxidation process for iron-chromium-aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A kind of iron-chromium-aluminum alloy anodic oxidation electrolytic solution and oxidation process based on corrosion inhibitor, the steps are as follows:

[0024] (1) Grinding treatment: use 600#, 1000#, 1500# sandpaper to grind the iron-chromium-aluminum alloy in sequence, then put it into an ethanol solution for ultrasonic cleaning for 3 minutes, take it out, rinse it with deionized water for 30 seconds, and dry it in the air.

[0025] (2) Surface degreasing: Put the polished alloy into acetone solution and soak for 5 minutes to degrease, take it out, rinse it with deionized water for 30 seconds, and dry it in the air.

[0026] (3) Pickling and polishing: HNO 3 The concentration of the solution is 15% by volume, and the reaction time is 5 minutes. The oxides on the surface of the alloy are washed away. After taking it out, it is washed with deionized water for 30 seconds and dried in the air.

[0027] (4) Solution preparation: Pour 0.8 mol of sulfuric acid solution...

Embodiment 2

[0031] A corrosion inhibitor-based iron-chromium-aluminum alloy anode oxidation electrolyte and oxidation process.

[0032] The preparation method of the present embodiment is different from embodiment 1 except step (4) (5), and all the other repeat embodiment 1 step, concrete process is as follows:

[0033] (1) grinding treatment: repeat step (1) in embodiment 1;

[0034] (2) surface degreasing: repeat step (2) in embodiment 1;

[0035] (3) pickling polishing: repeat step (3) in embodiment 1;

[0036] (4) Solution preparation: Pour 0.9mol of sulfuric acid solution into 1L of deionized water, then add 1.25g of Y 2 o 3 Add it to the prepared sulfuric acid aqueous solution, put it into a magnetic stirrer and stir for 2 hours, then cool to room temperature.

[0037] (5) Anodizing: Anodizing is carried out with the configured anodizing electrolyte. The anodizing temperature is room temperature, and the anodizing current density is 11mA / cm 2 , the reaction time is 55min, then...

Embodiment 3

[0040] A corrosion inhibitor-based iron-chromium-aluminum alloy anode oxidation electrolyte and oxidation process.

[0041] The preparation method of the present embodiment is different from embodiment 1 except step (4) (5), and all the other repeat embodiment 1 step, concrete process is as follows:

[0042] (1) grinding treatment: repeat step (1) in embodiment 1;

[0043] (2) surface degreasing: repeat step (2) in embodiment 1;

[0044] (3) pickling polishing: repeat step (3) in embodiment 1;

[0045] (4) Solution preparation: Pour 1mol of sulfuric acid solution into 1L of deionized water, then add 2.5g of Y 2 o 3 Add it to the prepared sulfuric acid aqueous solution, put it into a magnetic stirrer and stir for 2 hours, then cool to room temperature.

[0046] (5) Anodizing: Anodizing is carried out with the configured anodizing electrolyte. The anodizing temperature is room temperature, and the anodizing current density is 12mA / cm 2 , the reaction time is 60min, then ta...

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Abstract

The invention provides a corrosion inhibitor-based anodic oxidation electrolyte and oxidation process for an iron-chromium-aluminum electrothermal alloy. In the anodic oxidation electrolyte, the concentration of sulfuric acid is 0.8-1.2mol / L, a corrosion inhibitor is added into a sulfuric acid electrolyte, and the corrosion inhibitor is Y2O3 with different concentrations. The oxidation process comprises the following steps: carrying out grinding treatment, surface oil removal, acid washing and anodic oxidation, and finally completing the whole anodic oxidation process, and growing an oxide film on an iron-chromium-aluminum alloy matrix. An anodic oxidation temperature is room temperature (not greater than 30 DEG C), a constant current density is controlled to be 10-14mA / cm<2>, and an oxidation time is 45-75min. The electrolyte is low in formula cost and simple to prepare; the corrosion resistance of the iron-chromium-aluminum alloy can be improved to a great extent due to the additionof the corrosion inhibitor; and the electrolyte is suitable for popularized in industrial production.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to adding a corrosion inhibitor to an electrolyte to form an oxide film by anodic oxidation technology. Background technique [0002] Iron-chromium-aluminum alloy is a kind of metal material widely used in industry. Because of its high resistivity, high temperature resistance and low price, it is widely used in electric heating parts. However, in practical applications, components are often damaged due to short circuit, pitting corrosion and other reasons. Therefore, proper surface treatment must be carried out before use to improve its protective performance. At present, the commonly used iron-chromium-aluminum alloy surface treatment process is heat treatment process, which consumes high energy and has poor protection effect. The oxide film formed by the anodic oxidation method can protect the alloy well, and the process is simple, the cost is low, and the energy consumpti...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/16
CPCC25D11/08C25D11/16
Inventor 李光玉杨佳霖
Owner JILIN UNIV