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Preparation method of aluminum alloy cobalt salt chemical conversion coating treating fluid

A technology of conversion treatment and cobalt salt chemistry, applied in the coating process of metal materials, etc., can solve problems such as unsuitable for large-scale use, strong pungent smell, and complicated preparation methods

Active Publication Date: 2013-08-28
HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This study found that the use of hydrogen peroxide as an oxidant has the following disadvantages, such as strong pungent odor, large dosage, complicated preparation method, and is not suitable for large-scale use

Method used

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  • Preparation method of aluminum alloy cobalt salt chemical conversion coating treating fluid
  • Preparation method of aluminum alloy cobalt salt chemical conversion coating treating fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1060 aluminum alloy surface cobalt salt chemical transformation method, comprises the following steps:

[0041] (1) Aluminum alloy surface pretreatment process

[0042] First put the 1060 aluminum alloy sample into the degreasing agent to remove the oil stains during surface machining, and the soaking time is 10 minutes;

[0043] After washing with water, put it into an alkaline solution at 70°C for 40 seconds to remove the thin natural oxide layer on the surface. Each liter of alkaline solution is composed of 10g sodium carbonate and 25g sodium hydroxide; after washing with water, put it into a 25% volume percent dilute nitric acid solution Soak for 40s to neutralize; finally wash with water.

[0044] (2) Configuration of cobalt salt chemical conversion treatment solution: every liter of cobalt salt chemical conversion treatment solution contains 30g cobalt chlorate hydrate, 2g lithium permanganate, 2g sodium permanganate, 3g ligand sodium nitrite, the pH of the treat...

Embodiment 2

[0047] A method for chemical conversion of cobalt salt on the surface of 2117 aluminum alloy, comprising the following steps:

[0048] (1) Aluminum alloy surface pretreatment procedure is the same as embodiment 1

[0049] (2) Configuration of cobalt salt chemical conversion treatment solution: every liter of cobalt salt chemical conversion treatment solution contains 30g cobalt chlorate hydrate, 6g lithium permanganate, 6g sodium permanganate, 3g ligand sodium nitrite, the pH of the treatment solution The value is 3.

[0050] (3) The cobalt salt chemical conversion treatment on the surface of the aluminum alloy is to put the pretreated sample into the cobalt salt chemical conversion treatment solution prepared at 50°C for 20 minutes, take it out, wash it with running water, and then ultrasonically clean it with water for 5 minutes. drying.

Embodiment 3

[0052] 7050 aluminum alloy surface cobalt salt chemical transformation method, comprises the following steps:

[0053] (1) Aluminum alloy surface pretreatment process

[0054] First put the 7050 aluminum alloy sample into the degreasing agent to remove the oil stains during surface machining, and the soaking time is 20 minutes;

[0055] After washing with water, put it into an alkaline solution at 60°C for 30 seconds to remove the thin natural oxide layer on the surface. Each liter of alkaline solution is composed of 20g sodium carbonate and 15g sodium hydroxide; after washing with water, put it into a 35% volume percent dilute nitric acid solution Soak for 30s to neutralize; finally wash with water.

[0056] (2) Configuration of cobalt salt chemical conversion treatment solution: per liter of cobalt salt chemical conversion treatment solution contains, 20g cobalt chlorate hydrate, 10g cobalt nitrate hydrate, 20g lithium permanganate, 10g sodium permanganate, 3g ligand nitrou...

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Abstract

The invention relates to a preparation method of aluminum alloy cobalt salt chemical conversion coating treating fluid, belonging to the field of aluminum alloy surface treatment. A porous chemical conversion coating formed by treating aluminum alloy through treating fluid has the characteristics of no chromium, environment friendliness, and good corrosion resistance property, and the like, the treating fluid is prepared from cobalt salt, oxidant, ligand and water, wherein per liter of cobalt salt chemical conversion treating fluid contains the following compositions by weight: 20-50g of cobalt salt, 1-50g of an oxidant, and 2-7g of ligand, and the PH value of the treating fluid ranges from 3 to 4; the cobalt salt is selected from one or two of cobalt-nitrate hydrate and cobalt-chloride hydrate; the oxidant is selected from one or more of lithium permanganate, sodium permanganate, ammonia permanganate and calcium permanganate; and the ligand is selected from one or two of sodium nitrite or sodium acetate.

Description

technical field [0001] The invention relates to the treatment of aluminum alloy decoration and protective coating for aviation. Specifically, it is a treatment method for an environmentally friendly chromium-free chemical conversion coating on aluminum alloys used in aviation. The porous chemical conversion coating formed has excellent corrosion resistance and coating adhesion after being sealed, and can replace the traditional chemical conversion of chromium salts. Processing technology. Background technique [0002] Pure aluminum and aluminum alloys will form a natural oxide film layer when exposed to the air, but the thickness is thin and easy to break, and the corrosion resistance is poor. For this reason, it needs to be treated with coating. There are two types of conversion coatings used for coating, which are obtained by porous anodic oxidation and chemical oxidation respectively. [0003] Chemical oxidation treatment is a process of chemically reacting metal alumin...

Claims

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Application Information

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IPC IPC(8): C23C22/56
Inventor 马迪李申李树白浦静雯
Owner HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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