Method of evaluating hole sealing quality of anodic oxide film

An anodic oxidation film and anodic oxidation technology, applied in the direction of removing certain components and weighing, can solve the problems of poor correlation of phosphoric chromic acid method, shorten the test soaking time, reduce the amount of corrosion, etc., and achieve the effect of good correlation

Active Publication Date: 2018-12-07
GUANGDONG XINGFA ALUMINUM
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Problems solved by technology

[0003] Relatively mature methods include pre-soaking phosphochromic acid method with (without) nitric acid and pre-soaking phosphoric acid with (without) nitric acid, which are recorded in international standards ISO3210:2010, GB / T8753.1-2017 and GB / T8013.1-2018. method, with (without) nitric acid pre-soaked phosphomolybdic acid method, there are six methods in total, but these methods still have certain limitations from the perspective of environmental protection, or from the accuracy of the test, and are not the best method
[0004] Pre-soaking phosphochromic acid with (without) nitric acid is a traditional method, in which the reagent chromium trioxide contains hexavalent chromium, which is extremely toxic, which is not conducive to the occupational health and safety requirements of operators, and is also harmful to the environment great
[0005] Pre-soaking phosphoric acid with (without) nitric acid is based on the traditional method of phosphoric chromic acid, simply removes the poisonous and corrosion-inhibiting agent chromium trioxide, so the corrosion solution only contains phosphoric acid as a corrosion agent, less The effect of the corrosion inhibitor, the corrosion speed is accelerated. This method simply shortens the test immersion time to reduce the amount of corrosion. The test immersion time is reduced from 15 minutes of phosphochromic acid to 13 minutes. The effect of the corrosion inhibitor in the test cannot be simply reduced. Test soak time instead, phosphoric acid method correlates poorly with traditional phosphochromic acid method
[0006] (No) nitric acid pre-soaking phosphomolybdic acid method is an innovative method in China, using sodium molybdate instead of chromium trioxide as a corrosion inhibitor, which is beneficial to environmental protection, and for the sample test with full coverage of oxide film, it is different from the traditional method of phosphochromic acid method The correlation is very good, but for samples with a large proportion of the exposed area of ​​the aluminum metal substrate, because sodium molybdate reacts with the exposed metal aluminum to form a passivation film under acidic conditions, there will be a weight gain effect, so the test results will be affected to a certain extent. accuracy

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  • Method of evaluating hole sealing quality of anodic oxide film
  • Method of evaluating hole sealing quality of anodic oxide film
  • Method of evaluating hole sealing quality of anodic oxide film

Examples

Experimental program
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Embodiment 1

[0051] This embodiment provides a method for evaluating the quality of anodized film sealing. The profiles evaluated in this embodiment include: X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, and also include Anodized (including sealing) profile blank 1# and blank 2#, the concentration of magnesium sulfate used when preparing the magnesium phosphate solution is 20g / L, and the evaluation method is realized by the following steps:

[0052] Step 1: Measurement of the anodized area of ​​the sample, measure the size of the sample with a vernier caliper, and calculate the anodized area A of the sample (retain 2 decimal places).

[0053] Step 2: Degreasing. At room temperature, scrub and degrease the sample in absolute ethanol.

[0054] Step 3: Drying, air-dry the sample at room temperature (pre-drying) for 5 minutes, then place it upright in a preheated drying oven at 60°C for 15 minutes, and then place the sample on top of the silica gel in a sealed desiccator to cool for 30 minutes.

...

Embodiment 2

[0075] The present embodiment provides a kind of evaluation method of anodized film sealing quality, and the sample evaluated in the present embodiment is identical with embodiment 1, and the concentration of the magnesium sulfate that adopts when preparing magnesium phosphate solution is 20g / L, evaluates The method is implemented through the following steps:

[0076] Steps 1 to 4 follow the method in Example 1.

[0077] Step 5: Phosphomagnesic acid method, immerse the sample upright in the pre-heated magnesium phosphate solution for 15 minutes, and the test temperature is 38°C; take the sample out of the test solution, wash it with tap water first, and then with deionized water; finally Weigh the sample mass immediately after drying according to step 3 (m 2 ), accurate to 0.1 mg; the result calculation is according to the calculation method in Example 1.

Embodiment 3

[0079] The present embodiment provides a kind of evaluation method of anodized film sealing quality, and the sample evaluated in the present embodiment is identical with embodiment 1, and the concentration of the magnesium sulfate that adopts when preparing phosphomagnesic acid solution is 50g / L, evaluates The method is implemented through the following steps:

[0080] Steps 1 to 4 follow the method in Example 1.

[0081] Step 5: Phosphomagnesic acid method, immerse the sample upright in the preheated magnesium phosphatic acid solution for 15 minutes, and the test temperature is 38°C; take the sample out of the test solution, wash it with tap water first, and then with deionized water; Finally weigh the sample mass (m) immediately after drying according to step 3 2 ), accurate to 0.1 mg; the result calculation is according to the calculation method in Example 1.

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Abstract

The invention provides a method of evaluating the hole sealing quality of an anodic oxide film. The method comprises the following steps: measuring the anodic oxidation area of a test sample, degreasing, weighing, carrying out phosphorous magnesium acid process, and then calculating to obtain the weight loss per unit area of the test sample. The method for evaluating the hole sealing quality of the anodic oxide film is an environmentally friendly method of testing the hole sealing quality of anodic oxide films of aluminum and aluminum alloy, and has a strong correlation with a phosphoric chromium acid method which is a conventional test method.

Description

technical field [0001] The invention relates to a method for evaluating the sealing quality of an anodized film, which belongs to the field of nonferrous metal processing. Background technique [0002] The sealing quality of anodized film is an important indicator of the corrosion resistance of aluminum and aluminum alloy anodized film, which can reflect the quality level and service life of the product while inspecting the quality level of the production process. Before 2010, domestic and foreign have been using (without) nitric acid pre-soaked phosphochromic acid method (hereinafter referred to as phosphochromic acid method) for testing. Since 2010, with the continuous strengthening of domestic and foreign awareness of environmental protection, the application of heavy metals, especially the highly toxic hexavalent chromium, has been restricted. The reagent chromium trioxide used in the phosphochromic acid method contains hexavalent chromium. Hexavalent chromium is easily...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 夏秀群梁金鹏张娟
Owner GUANGDONG XINGFA ALUMINUM
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