WO2023231623A1 - Long-acting corrosion-resistant treatment process for solar aluminum frame - Google Patents

Abstract

The present invention relates to the technical field of solar aluminum frames, and in particular to a long-acting corrosion-resistant treatment process for a solar aluminum frame, comprising the following specific steps: step 1, respectively preparing a NaOH solution having a solubility of 30-50 g/L, a H₂SO₄ solution having a solubility of 150-220 g/L, and an H₂SO₄ solution having a solubility of 150-170 g/L; step 2, immersing an aluminum frame in an alkaline washing tank in which the concentration of NaOH is 30-50 g/L, so as to clean same; step 3, immersing the aluminum frame in an H₂SO₄ neutralizing tank in which the concentration of H₂SO₄ is 150-220g/L, so as to clean same; step 4, immersing the aluminum frame in an H₂SO₄oxidation tank in which the concentration of H₂SO₄ is 150-170g/L, so as to oxidize same by using anode current; step 5, immersing the aluminum frame in a hole sealing tank in which the concentration of LNi2+ is 0.9-1.1 g/L, so as to perform hole sealing; and step 6, immersing the aluminum frame in a washing tank so as to clean same by using pure water, then taking out the aluminum frame and drying same in the air. The present invention can effectively solve the problems such as the compactness of an oxidation film of a profile, and the hole sealing quality.

Description

A long-term corrosion-resistant treatment process for solar aluminum frames Technical field

The invention relates to the technical field of solar aluminum frames, in particular to a long-term corrosion-resistant treatment process for solar aluminum frames.

Background technique

Aluminum alloys are widely used in light industry, building materials, aerospace, electronics and other fields due to their small specific gravity, good processing performance, excellent electrical and thermal conductivity, good plasticity, strong resistance to atmospheric corrosion, easy forming, and low price. . In addition to improving the corrosion resistance and hardness of aluminum and its alloys, anodized films can also be used as good functional materials. Research and applications in this area have also achieved considerable results. Currently, the commonly used anodizing methods include boric acid for aluminum alloys. Research on sulfuric acid anodizing process, oxalic acid anodizing, sulfuric acid anodizing, alternating current anodizing, etc. Nowadays, solar aluminum frames mostly use sulfuric acid anodizing + room temperature sealing process. The aluminum alloy sulfuric acid anodized film has higher hardness and better corrosion protection and decorative effects.

New energy power generation has always been an area that the country attaches great importance to. The solar power generation industry has developed rapidly in recent years. Solar energy is a clean energy source. The process of converting solar energy into electrical energy will not cause pollution to the environment. Therefore, a large number of photovoltaic power stations are built in various places. The demand for photovoltaic module products has also doubled, of which the aluminum alloy frame of solar panels is also part of the module. The solar frame is made of extruded aluminum profiles, which are then surface treated and deeply processed. The requirements for the frame of photovoltaic solar modules are higher than those of ordinary aluminum alloy profiles. The average thickness of the oxide film of ordinary aluminum alloy profiles is 10 μm, while the frame of photovoltaic modules must reach 15 μm. Because the photovoltaic module frame is easily exposed to outdoor environment and bad weather for a long time, causing frame corrosion, it is necessary to perform corrosion-resistant treatment on the surface of the aluminum frame of the solar module.

For example, the Chinese invention patent with patent number CN202011468311.2 discloses a method for treating a long-lasting corrosion-resistant coating on the surface of the aluminum frame of a solar module, which specifically includes the following steps: S1: Prepare electrolyte: Configure the electrolyte in proportion, add KOH, NaAlO ₂ , Na4P ₂ O ₇ , and MoS ₂ to deionized water or distilled water to dissolve. The concentration of KOH is ≤4g/L, the concentration of NaAlO ₂ is ≤4g/L, and the concentration of Na4P ₂ O ₇ is ≤4g/L. The concentration of MoS 2 is 4-8g/L, and the concentration of MoS ₂ is ≤5g/L. After stirring evenly, the micro-arc oxidation electrolyte is obtained; S2: Micro-arc oxidation: Place the aluminum frame of the solar module into the electrolytic cell of the micro-arc oxidation system. For the anode, a stainless steel plate is used as the cathode, and the micro-arc oxidation power supply is connected. During the entire micro-arc oxidation process, the control power supply outputs a positive-phase pulse current of 5-10A/dm ² and a negative-phase pulse current of 2-5A/dm ² . The output frequency is 500-1000HZ, the duty cycle is 5-10%, the oxidation time is 10-30min, and the electrolyte temperature is maintained at 10-30°C; S3: Wash the aluminum frame of the solar module after the micro-arc oxidation treatment in step S2 with ultrasonic water.

Using this treatment method cannot effectively solve problems such as the tightness of the profile's oxide film and the quality of the hole sealing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a long-term corrosion-resistant treatment process for solar aluminum frames. This treatment process can effectively solve problems such as the compactness of the oxide film of the profile and the quality of the hole sealing.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a long-term corrosion-resistant treatment process for solar aluminum frames. The specific steps are as follows:

Step 1: Prepare NaOH solution, 150-220g/LH ₂ SO ₄ solution, and 150-170g/LH ₂ SO ₄ solution with a solubility of 30-50g/L respectively;

Step 2: Immerse the aluminum frame into a NaOH alkaline washing tank with a concentration of 30-50g/L, clean it, and then take it out;

Step 3: Immerse the aluminum frame into a neutralization tank with a concentration of 150-220g/LH ₂ SO ₄ for cleaning, then take it out and clean it with pure water;

Step 4: Immerse the aluminum frame into an oxidation tank with a concentration of 150-170g/LH ₂ SO ₄ and oxidize it at an anode current of 5-9A/dm ² , then take it out and rinse it with pure water;

Step 5: Dip the aluminum frame into the sealing tank with a concentration of 0.9-1.1g/LNi ²⁺ to seal the holes, then take it out and seal it with pure water cleaning;

Step 6: Dip the aluminum frame into the washing tank and clean it with pure water, then take it out to dry.

As a further solution of the present invention, the temperature in the alkali washing tank in step two is 30-50°C, the cleaning is 1-5 minutes, and the Al ³⁺ concentration in the alkali washing tank is ≤65g/L.

As a further aspect of the present invention, the reaction time in the neutralization tank in step three is 1-5 minutes.

As a further solution of the present invention, the temperature of the oxidation tank in step 4 is 10-20°C, the Al ³⁺ concentration is ≤ 18g/L, and the oxidation time is 30-45 minutes.

As a further solution of the present invention, the temperature of the sealing tank in step 5 is 58-62°C, the sealing time is 10-24 minutes, and the pH is 5.4-5.6.

As a further solution of the present invention, the temperature of the water washing tank in step 6 is 40-70°C.

Since the present invention adopts the above technical solution, the advantages and positive effects of the present invention are: the aluminum frame profile is anodized + medium-temperature hole sealing under the treatment process conditions. After oxidation, the film thickness of the profile is uniform, and there is no corrosion or other oxidation defects on the surface of the profile. , there is no color difference or dusting surface defects on the surface of the profile after sealing.

Detailed ways

Example 1

The invention provides a long-term corrosion-resistant treatment process for solar aluminum frames. The specific steps are as follows:

Step 1: Prepare NaOH solution, 150g/LH ₂ SO ₄ solution, and 150g/LH ₂ SO ₄ solution with a solubility of 30g/L respectively;

Step 2: Immerse the aluminum frame into a NaOH alkaline washing tank with a concentration of 30g/L and clean it. The temperature in the alkali washing tank is 30°C. Clean it for 1 minute. The Al ³⁺ concentration in the alkali washing tank is 25g/L and then take it out;

Step 3: Immerse the aluminum frame into a neutralization tank with a concentration of 150g/LH ₂ SO ₄ and react for 1 minute, then take it out Wash with pure water;

Step 4: Immerse the aluminum frame into an oxidation tank with a concentration of 150g/LH ₂ SO ₄ and oxidize it at an anode current of 5A/dm ^2. The temperature of the oxidation tank is 10°C, the Al ³⁺ concentration is 10g/L, oxidize for 30 minutes, and then take it out for use. Rinse with pure water;

Step 5: Dip the aluminum frame into a sealing tank with a concentration of 0.9g/LNi ²⁺ and seal the holes. The temperature of the sealing tank is 58°C, the holes are sealed for 10 minutes, and the pH is 5.4. Then take it out and clean it with pure water;

Step 6: Immerse the aluminum frame in pure water in a washing tank with a temperature of 40°C, clean it, and then take it out to dry.

Example 2

A long-term corrosion-resistant treatment process for solar aluminum frames. The specific steps are as follows:

Step 1: Prepare NaOH solution, 185g/LH ₂ SO ₄ solution, and 160g/LH ₂ SO ₄ solution with a solubility of 40g/L respectively;

Step 2: Immerse the aluminum frame into a NaOH alkaline washing tank with a concentration of 40g/L for cleaning. The temperature in the alkali washing tank is 40°C. Clean for 3 minutes. The Al ³⁺ concentration in the alkali washing tank is 45g/L and then taken out;

Step 3: Immerse the aluminum frame into a neutralization tank with a concentration of 185g/LH ₂ SO ₄ and react for 3 minutes, then take it out and clean it with pure water;

Step 4: Immerse the aluminum frame into an oxidation tank with a concentration of 160g/LH ₂ SO ₄ and oxidize it at an anode current of 7A/dm ^2. The temperature of the oxidation tank is 15°C, the Al ³⁺ concentration is 14g/L, oxidize for 38 minutes, and then take it out for use. Rinse with pure water;

Step 5: Dip the aluminum frame into a sealing tank with a concentration of 1.0g/LNi ²⁺ and seal the holes. The temperature of the sealing tank is 60°C, the holes are sealed for 17 minutes, and the pH is 5.5. Then take it out and clean it with pure water;

Step 6: Immerse the aluminum frame into pure water in a washing tank with a temperature of 55°C, clean it, and then take it out to dry.

Example 3

A long-term corrosion-resistant treatment process for solar aluminum frames, which is characterized by: the specific steps are as follows:

Step 1: Prepare NaOH solution, 220g/LH ₂ SO ₄ solution, and 170g/LH ₂ SO ₄ solution with a solubility of 50g/L respectively;

Step 2: Immerse the aluminum frame into a NaOH alkaline washing tank with a concentration of 50g/L for cleaning. The temperature in the alkali washing tank is 50°C. Clean for 5 minutes. The Al ³⁺ concentration in the alkali washing tank is 65g/L, and then take it out;

Step 3: Immerse the aluminum frame into a neutralization tank with a concentration of 220g/LH ₂ SO ₄ and react for 5 minutes, then take it out and clean it with pure water;

Step 4: Immerse the aluminum frame into an oxidation tank with a concentration of 170g/LH ₂ SO ₄ and oxidize it at an anode current of 9A/dm ^2. The temperature of the oxidation tank is 20°C, the Al ³⁺ concentration is 18g/L, oxidize for 45 minutes, and then take it out. Rinse with pure water;

Step 5: Dip the aluminum frame into a sealing tank with a concentration of 1.1g/LNi ²⁺ and seal the holes. The temperature of the sealing tank is 62°C, the holes are sealed for 24 minutes, and the pH is 5.6. Then take it out and clean it with pure water;

Step 6: Wash with pure water immersed in a washing tank with a temperature of 70°C, and then take it out to dry.

Table 1 shows the test data of 4 aluminum frames using the above treatment process.

As can be seen from Table 1, the weight loss experiment was carried out without aging after oxidation sealing. The weight loss values in the experiment were all less than 30, which greatly reduced the waiting time for oxidation. The aluminum frame was anodized + medium temperature under the processing conditions of the present invention. After sealing and oxidation, the film thickness of the profile is uniform, and there are no oxidation defects such as corrosion on the surface of the profile. After sealing, there is no color difference or dusting surface defects on the surface of the profile after sealing.

Although specific embodiments of the present invention have been described above, those skilled in the art should understand that It should be understood that these are only examples and various changes or modifications can be made to this embodiment without departing from the principle and essence of the invention. The protection scope of the invention is only limited by the appended claims.

Claims (6)

A long-term corrosion-resistant treatment process for solar aluminum frames, which is characterized by: the specific steps are as follows: Step 1: Prepare NaOH solution, 150-220g/LH ₂ SO ₄ solution, and 150-170g/LH ₂ SO ₄ solution with a solubility of 30-50g/L respectively; Step 2: Immerse the aluminum frame into a NaOH alkaline washing tank with a concentration of 30-50g/L, clean it, and then take it out; Step 3: Immerse the aluminum frame into a neutralization tank with a concentration of 150-220g/LH ₂ SO ₄ for cleaning, then take it out and clean it with pure water; Step 4: Immerse the aluminum frame into an oxidation tank with a concentration of 150-170g/LH ₂ SO ₄ and oxidize it at an anode current of 5-9A/dm ² , then take it out and rinse it with pure water; Step 5: Dip the aluminum frame into the sealing tank with a concentration of 0.9-1.1g/LNi ²⁺ to seal the holes, then take it out and clean it with pure water; Step 6: Dip the aluminum frame into the washing tank and clean it with pure water, then take it out to dry. A long-term corrosion-resistant treatment process for solar aluminum frames according to claim 1, characterized in that: in step two, the temperature in the alkali washing tank is 30-50°C, and the cleaning time is 1-5 minutes. ³⁺ concentration ≤65g/L. A long-term corrosion-resistant treatment process for solar aluminum frames according to claim 1, characterized in that: the reaction time in the neutralization tank in step three is 1-5 minutes. A long-term corrosion-resistant treatment process for solar aluminum frames according to claim 1, characterized in that: the temperature of the oxidation tank in step 4 is 10-20°C, the Al ³⁺ concentration is ≤ 18g/L, and the oxidation time is 30 -45min. A long-term corrosion-resistant treatment process for solar aluminum frames according to claim 1, characterized in that: the temperature of the sealing groove in step 5 is 58-62°C, the sealing time is 10-24min, and the pH is 5.4- 5.6. A long-term corrosion-resistant treatment process for solar aluminum frames according to claim 1, characterized in that: the temperature of the water washing tank in step 6 is 40-70°C.