AZ31B magnesium alloy golden conversion film treatment agent and AZ31B magnesium alloy surface treatment method

Abstract

The invention discloses an AZ31B magnesium alloy golden conversion film treatment agent and an AZ31B magnesium alloy surface treatment method. The AZ31B magnesium alloy golden conversion film treatment agent comprises components with the following concentrations: 1-25 g / l of 98% of sulfuric acid, 1-25 g / l of 50% of manganese nitrate, 1-25 g / l of potassium permanganate, 0.1-1 g / l of metavanadate, 0.01-0.05 ml / l of dispersing agent, and the balance of water. After the AZ31B magnesium alloy golden conversion film treatment agent is applied to the surface treatment of AZ31B magnesium alloys, golden conversion films can be formed on the surfaces of the AZ31B magnesium alloys, so that the corrosion resistance of the AZ31B magnesium alloys can be improved. The formed golden conversion films havethe advantages of good adhesion, good salt mist performance and good film forming uniformity. In addition, the AZ31B magnesium alloy golden conversion film treatment agent contains no phosphorus and chromium, so that the problem of environmental pollution caused by common use of phosphorus and chromium in traditional alloy treatment agents is prevented, no environmental pollution is generated, andthe environmental protection is better.

Description

technical field

[0001] The invention relates to the technical field of surface treatment, in particular to an AZ31B magnesium alloy golden yellow conversion film treatment agent and an AZ31B magnesium alloy surface treatment method. Background technique

[0002] Magnesium alloys can be divided into two categories according to the manufacturing process: wrought magnesium alloys and cast magnesium alloys. AZ31B magnesium alloy belongs to wrought magnesium alloy. Compared with cast magnesium alloy, AZ31B wrought magnesium alloy has higher strength and better plasticity, and is mainly used for thin plates, extrusions and forgings.

[0003] As a high-strength magnesium alloy, AZ31B magnesium alloy has a higher specific strength than high-strength 6063 aluminum alloy. As long as the key problems of AZ31B magnesium alloy deformation and surface corrosion protection are solved, it is very likely that quite a few aluminum alloy products will use AZ31B. Magnesium alloy will bring ano...

Examples

Embodiment 1

[0071] AZ31B magnesium alloy is used, and the sample size is 48mm×20mm×2.3mm.

[0072] 1. Degreasing: Degreasing agents include: sodium hydroxide 10 g / L, sodium tripolyphosphate 20 g / L, sodium metasilicate 5 g / L, sodium gluconate 2 g / L, OP-10 emulsifier 1.25 g / L liters and K12 anionic active agent 1 g / liter. The temperature is 60 degrees Celsius, and the treatment is 6 minutes. After washing with water, put it into the pickling solution below.

[0073] 2. Pickling and etching: etchant includes: 50 ml / liter of nitric acid and 0.2 ml / liter of low-foaming surfactant. The temperature is normal temperature, and the treatment takes 30 to 60 seconds. After washing with water, put it into the table conditioning solution below;

[0074] 3. Surface adjustment bleaching: the surface adjustment is 50-100 g / L sodium hydroxide, the temperature is 60 degrees Celsius, and the time is 5 minutes. After washing with water, put it into the following conversion solution for processing;

[00...

Embodiment 2

[0081] Different from Example 1, the AZ31B magnesium alloy golden yellow conversion coating treatment agent includes each component of the following mass components:

[0082]

Embodiment 3

[0084] Different from Example 1, the AZ31B magnesium alloy golden yellow conversion coating treatment agent includes each component of the following mass components:

[0085]

technical field

[0001] The invention relates to the technical field of surface treatment, in particular to an AZ31B magnesium alloy golden yellow conversion film treatment agent and an AZ31B magnesium alloy surface treatment method. Background technique

[0002] Magnesium alloys can be divided into two categories according to the manufacturing process: wrought magnesium alloys and cast magnesium alloys. AZ31B magnesium alloy belongs to wrought magnesium alloy. Compared with cast magnesium alloy, AZ31B wrought magnesium alloy has higher strength and better plasticity, and is mainly used for thin plates, extrusions and forgings.

[0003] As a high-strength magnesium alloy, AZ31B magnesium alloy has a higher specific strength than high-strength 6063 aluminum alloy. As long as the key problems of AZ31B magnesium alloy deformation and surface corrosion protection are solved, it is very likely that quite a few aluminum alloy products will use AZ31B. Magnesium alloy will bring ano...

Examples

Embodiment 1

[0071] AZ31B magnesium alloy is used, and the sample size is 48mm×20mm×2.3mm.

[0072] 1. Degreasing: Degreasing agents include: sodium hydroxide 10 g / L, sodium tripolyphosphate 20 g / L, sodium metasilicate 5 g / L, sodium gluconate 2 g / L, OP-10 emulsifier 1.25 g / L liters and K12 anionic active agent 1 g / liter. The temperature is 60 degrees Celsius, and the treatment is 6 minutes. After washing with water, put it into the pickling solution below.

[0073] 2. Pickling and etching: etchant includes: 50 ml / liter of nitric acid and 0.2 ml / liter of low-foaming surfactant. The temperature is normal temperature, and the treatment takes 30 to 60 seconds. After washing with water, put it into the table conditioning solution below;

[0074] 3. Surface adjustment bleaching: the surface adjustment is 50-100 g / L sodium hydroxide, the temperature is 60 degrees Celsius, and the time is 5 minutes. After washing with water, put it into the following conversion solution for processing;

[00...

Embodiment 2

[0081] Different from Example 1, the AZ31B magnesium alloy golden yellow conversion coating treatment agent includes each component of the following mass components:

[0082]

Embodiment 3

[0084] Different from Example 1, the AZ31B magnesium alloy golden yellow conversion coating treatment agent includes each component of the following mass components:

[0085]

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