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Cobalt salt chemical conversion solution and application thereof

A technology of cobalt salt chemistry and conversion liquid, applied in the direction of metal material coating process, etc., can solve the problems of large human injury, serious environmental pollution, and high energy consumption, achieve reasonable formula, improve corrosion resistance and adhesion, and form film. Efficiency improvement effect

Inactive Publication Date: 2018-06-19
JIANGSU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems existing in the existing aluminum alloy cobalt salt chemical conversion solution, such as serious environmental pollution, great harm to human body, high energy consumption, and inconspicuous performance, the object of the present invention is to provide a chemical conversion solution of

Method used

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  • Cobalt salt chemical conversion solution and application thereof
  • Cobalt salt chemical conversion solution and application thereof
  • Cobalt salt chemical conversion solution and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1-6:

[0019] Inorganic film-forming accelerator H under different oxidant conditions 2 O 2 The influence experiment of the prepared conversion liquid.

[0020]

[0021] In order to determine the optimal components of the additives in the formula, select the same amount of 6 additives for parallel experiments, and keep the other components and dosages in the formula exactly the same. Through the following process flow, the 6 kinds of cobalt salt chemical conversion solutions are compared and analyzed:

[0022] (1) Pretreatment:

[0023] Degreasing, alkaline washing and acid washing are performed on the surface of the aluminum sheet to remove oxide film and oil stains.

[0024] (2) Chemical transformation:

[0025] A) Preparation of the conversion solution: accurately weigh the components in the above table, place them in a beaker after weighing, add 1L of water, stir to dissolve and heat in a water bath to 50°C.

[0026] B) Conversion into film: The pretreated aluminum she...

Example Embodiment

[0028] Example 7-12:

[0029] Inorganic film-forming accelerator NaClO under different oxidant conditions 3 The influence experiment of the prepared conversion liquid.

[0030]

[0031] Through the process flow described in Example 1, the Tafel curve of the conversion film formed from 6 kinds of cobalt salt chemical conversion solutions in 3.5% (wt) NaCl solution was measured, and the results are as follows figure 2 Shown.

[0032] by figure 2 It can be seen that adding Cu(NO 3 ) 2 The self-corrosion current density is obviously greater than that of other nitrates. From the perspective of self-corrosion potential, the inorganic film forming promoter is NaClO 3 Cu(NO 3 ) 2 When the oxidant is used, the self-corrosion potential of the conversion solution is only higher than that of NaNO 3 The oxidant is larger, indicating that the electrochemical reaction can obtain the relatively smallest motive force for controlling the corrosion reaction, so that the corrosion rate of the aluminum ...

Example Embodiment

[0033] Examples 13-17:

[0034] Organic film-forming accelerator C under different oxidant conditions 10 H 20 O effect experiment on the preparation of the conversion liquid.

[0035]

[0036] The process flow described in Example 1 was used to determine the corrosion resistance of the conversion coating formed from six cobalt salt chemical conversion solutions. The results are as follows image 3 Shown.

[0037] by image 3 It can be seen that adding Fe(NO 3 ) 3 , LiNO 3 And Ce(NO 3 ) 3 The conversion liquid has a complete semicircle in the high frequency area and Fe(NO 3 ) 3 The corresponding capacitive reactance arc radius is the largest, indicating that Fe 3+ The addition of the resulting conversion coating has strong corrosion resistance. Join NaNO 3 , Ca(NO 3 ) 2 , Cu(NO 3 ) 2 The capacitive reactance arcs of the conversion solution and the blank solution in the high-frequency region are not complete. The curve in the low-frequency region is approximately a straight line, which...

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Abstract

The invention provides a cobalt salt chemical conversion solution. The salt chemical conversion solution consists of main salt, a ligand, an oxidant, a film forming promoter and water, wherein every 1L of cobalt salt chemical conversion solution contains 25g of main salt, 20g of ligand, 0-45g of oxidant, 5-30g of film forming promoter and the balance of water. The cobalt salt chemical conversion solution can be used for the cobalt salt chemical conversion treatment of aluminum alloy components, and conversion treatment is carried out at the temperature of 50-60DEG C for 20-30 minutes. The formula of the cobalt salt chemical conversion solution is more reasonable, the film forming efficiency is increased, and industrial popularization and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, and specifically designs a cobalt salt chemical conversion liquid and its application. Background technique [0002] In the development process of aluminum alloy surface treatment technology, the aluminum alloy chemical conversion coating is developing towards excellent conversion film performance, and the treatment process liquid is developing towards the direction of non-toxic and environmental protection. With the increasing conflict between environmental issues and industrial development, the development of new green and environmentally friendly treatment processes has become particularly important. This topic mainly studies the preparation of a conversion film with better performance by adding different oxidant types or the same type of oxidant with different concentrations in the conversion liquid, and finally confirms the optimal formula and process conditions. Th...

Claims

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Application Information

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IPC IPC(8): C23C22/05
CPCC23C22/05
Inventor 马迪张听雨闾雪娇李树白于冬梅侯丹丹周熙雯
Owner JIANGSU UNIVERSITY OF TECHNOLOGY
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