TWI527908B - Aluminum alloy pretective agent and solution using same - Google Patents

Description

Aluminum alloy protective agent and its protective agent solution

The invention relates to an aluminum alloy protective agent, in particular to a 7-series aluminum alloy protective agent.

7 series aluminum alloy, also known as aerospace aluminum alloy, has the characteristics of high strength, light weight and high hardness, and is widely used in the electronics industry, aviation industry and automobile industry. The aluminum alloy parts are generally processed into a semi-finished product by a plurality of processes such as milling and polishing, and then anodized to form a final product. The aluminum alloy member generally needs to stay for a certain period of time between every two processing steps, during which the aluminum alloy member is exposed to the air, and oxidative discoloration is apt to occur.

In the prior art, a protective film is generally formed on the surface of the aluminum alloy member by ash oil to prevent oxidation during processing. However, after the processing is completed, it is necessary to clean the white wax oil protective film with a phosphorus-containing cleaning agent, which is easy to cause environmental pollution.

In view of the foregoing, it is necessary to provide an aluminum alloy protectant which is environmentally friendly and has a good protective effect.

An aluminum protective agent, the protective agent comprises an aluminum alloy components by weight percentage: 1-30% of CORRGUARD ^TM SI, 1% to 20 carbon atoms in the fatty acid of 13% or more, 1% -10% Organic amine, 1%-10% fatty acid with 6-12 carbon atoms, 0.5%-5% surfactant, 0.5%-3% co-emulsifier, 0.1%-0.5% anti-rust agent, And the balance of water.

A protective agent solution comprising the above aluminum alloy gold repellent, the concentration of the protective agent solution being from 1% to 20%.

The aluminum alloy protector of the invention can protect the aluminum alloy parts for a long time by using a lower concentration of the protective agent solution, thereby avoiding corrosion of the aluminum alloy parts and having high protection ability. Moreover, the protective agent is completely soluble in water, and compared with the traditional ash oil protective agent, it does not need to be cleaned by a phosphorus-containing cleaning agent, and can be cleaned and cleaned only with water, thereby reducing environmental pollution.

Figure 1 shows the results of surface topography of Samples 1-3.

Figure 2 shows the results of surface topography of samples 4-6.

Figure 3 shows the results of surface topography of samples 7-8.

The aluminum alloy protective agent of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Aluminum protectant of the present invention comprises the following components by weight percentage: 1-30% of CORRGUARD ^TM SI, 1% to 20 carbon atoms in the fatty acid of 13% or more, 1% -10% of an organic amine, 1%-10% of fatty acids having 6-12 carbon atoms, 0.5%-5% surfactant, 0.5%-3% co-emulsifier, 0.1%-0.5% rust inhibitor, and the balance water. Which, CORRGUARD ^TM SI for the US Dow Chemical Company (Dow chemical corporate) a corrosion inhibitor, trade name CORRGUARD ^TM SI. The aluminum alloy protectant of the present invention is completely soluble in water.

Preferably, the fatty acid having 13 or more carbon atoms includes one or more of castor oil fatty acid, tall oil fatty acid, soybean oil fatty acid, oleic acid, myristic acid, palmitic acid, and isomeric stearic acid. The organic amine includes one or more of triethanolamine, diethanolamine, monoethanolamine, 2-amino-2-methyl-1-propanol, and diglycolamine. The fatty acid having 6 to 12 carbon atoms includes one or more of capric acid, caprylic acid, isophthalic acid, neonic acid, sebacic acid, undecyl dibasic acid, and dodecane dibasic acid. The surfactant includes one or more of sodium petroleum sulfonate, sorbitan oleate, fatty alcohol polyoxyethylene ether, and castor oil polyoxyethylene ether. The co-emulsifier includes one or more of ethanol, propylene glycol, and isomeric alcohols. The rust inhibitor includes one or more of benzotriazole, 12 alkenyl succinic acid, and oleic acid sarcosine.

Preferably, the aluminum alloy protectant of the present invention comprises the following components by weight percentage: 1-30% of CORRGUARD ^TM SI, 1% -20% of castor oil fatty acid, 1% to 10% of 2-amino-2 -Methyl-1-propanol, 1%-10% isodecanoic acid, 0.5%-5% fatty alcohol polyoxyethylene ether, 0.5%-3% isomeric alcohol, 0.1%-0.5% styrene-acrylic acid Triazole, and the balance of water.

The present invention also provides a method of preparing the aluminum alloy protective agent, comprising the steps of: CORRGUARD ^TM SI, the number of carbon atoms of 13 or more fatty acids, organic amines, 6-12 carbon atoms, a fatty acid, a surfactant, The co-emulsifier and the rust preventive are mixed in proportion and stirred at normal temperature for 10 to 60 minutes to obtain a mixture A; the mixture A is slowly added to an appropriate amount of water, and stirred for 10 to 30 minutes to obtain the aluminum alloy protectant.

Example 1

Protective agent comprising aluminum components by weight percentage: 30% CORRGUARD ^TM SI, 20% of castor oil fatty acid, 10% 2-methyl-l-propanol, 10% isononanoic acid, 5% fatty alcohol polyoxyethylene ether, 3% isomeric alcohol, 0.5% benzotriazole, and the balance of water.

Example 2

Protective agent comprising aluminum components by weight percentage: 1% CORRGUARD ^TM SI, 1% of castor oil fatty acid, 1% 2-methyl-1-propanol, 1% - of isononanoic acid , 0.5% fatty alcohol polyoxyethylene ether, 0.5% isomeric alcohol, 0.1% benzotriazole, and the balance of water.

Example 3

Protective agent comprising aluminum components by weight percentage: 10% CORRGUARD ^TM SI, 10% of castor oil fatty acid, 5% of 2-methyl-1-propanol, 5% of the isononanoic acid, 5% fatty alcohol polyoxyethylene ether, 2% isomeric alcohol, 0.5% benzotriazole, and the balance of water.

The protective agent obtained in Examples 1-3 was diluted with water to obtain a protective agent solution having a concentration of 5%. Three sets of aluminum alloy samples were provided, numbered 1#, 2#, 3#3, and the three sets of aluminum alloy samples were washed with alcohol after being polished. In the present embodiment, Samples 1-3 are all 7003 aluminum alloys. The three sets of aluminum alloy samples were respectively immersed in the above three groups of 5% concentration of the protective agent solution for 3 minutes, and the three sets of aluminum alloy samples were taken out and placed in the room. The protective agent forms a protective film on the surface of the aluminum alloy sample by physical-chemical adsorption to prevent the aluminum alloy gold sample from being oxidized and etched. In the present embodiment, the temperature in the room is approximately 22 ° C, and the relative humidity in the room is approximately 75%. In the present embodiment, the sample 1 was immersed in the aluminum alloy repellent of Example 1, the sample 2 was immersed in the aluminum alloy repellent of Example 2, and the sample 3 was immersed in the aluminum alloy repellent of Example 3. The surface morphology of the three groups of aluminum alloy samples after a certain period of time was observed to determine the protective effect of the protective agent on the aluminum alloy samples (see Figure 1 for the surface topography of samples 1-3).

It can be seen from FIG. 1 that the aluminum alloy protective agent of the embodiment of the invention has a good protective effect on the aluminum alloy. The protective film formed by the 5% concentration of the protective agent solution on the surface of the aluminum alloy can ensure that the aluminum alloy piece is placed in the air for at least 8 hours without being corroded, thereby satisfying the requirement of the aluminum alloy piece to switch between the processes; By adjusting the formulation of the aluminum alloy protectant, the aluminum alloy parts can be prevented from being corroded within 120 hours in the air.

Further, the aluminum alloy protectant of the embodiment of the present invention is diluted with water to obtain a protective agent solution having different concentrations. In the present embodiment, the aluminum alloy protective agent of Example 1 was diluted and formulated into a protective agent solution having a concentration of 1%, 3%, 5%, 10%, and 20%, respectively. Five sets of identical aluminum alloy samples were provided, numbered 4#, 5#, 6#, 7#, 8#. The five sets of samples were separately immersed in the above five groups of protective agent solutions having different concentrations for 3 minutes, and the five sets of aluminum alloy samples were taken out and placed indoors. In the present embodiment, the samples 4-8 were all 7003 aluminum alloys, the indoor temperature was approximately 22 ° C, and the indoor relative humidity was approximately 75%. Observe the surface morphology of samples 4-8 after standing for a certain period of time to determine the protective effect of the protective agent on the aluminum alloy sample (see Figure 2 for the surface topography of samples 4-8).

It can be seen from Fig. 2 that as the concentration of the protective agent solution increases, the protective time of the protective agent on the aluminum alloy member gradually increases. A protective film of 1% concentration of the protective agent solution on the surface of the aluminum alloy ensures that the aluminum alloy part is placed in the air for at least 8 hours without being corroded. A 5% concentration of the protectant solution is in the aluminum alloy, which ensures that the aluminum alloy parts are placed for at least 120 hours without being corroded.

The aluminum alloy protective agent of the embodiment of the invention can protect the aluminum alloy parts for a long time by using a lower concentration of the protective agent solution, thereby avoiding corrosion of the aluminum alloy parts and having high effective protection ability. Moreover, the protective agent is completely soluble in water, and compared with the traditional ash oil protective agent, it does not need to be cleaned by a phosphorus-containing cleaning agent, and can be cleaned and cleaned only with water, thereby reducing environmental pollution.

In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.

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Claims (10)

An aluminum alloy protectant which improvement wherein the protective agent comprises an aluminum alloy components by weight percentage: 1-30% of CORRGUARD ^TM SI, the number of carbon atoms in the 1% -20% of the fatty acids of 13 or more, 1 %-10% organic amine, 1%-10% fatty acid with 6-12 carbon atoms, 0.5%-5% surfactant, 0.5%-3% co-emulsifier, 0.1%-0.5% Rust inhibitor, and the balance of water. The aluminum alloy protectant according to claim 1, wherein the fatty acid having 13 or more carbon atoms comprises castor oil fatty acid, tall oil fatty acid, soybean oil fatty acid, oleic acid, myristic acid, palmitic acid, and different One or more of stearic acid. The aluminum alloy protectant according to claim 1, wherein the organic amine comprises one of triethanolamine, diethanolamine, monoethanolamine, 2-amino-2-methyl-1-propanol, and diglycolamine. Or a variety. The aluminum alloy protectant according to claim 1, wherein the fatty acid having 6 to 12 carbon atoms comprises citric acid, octanoic acid, isophthalic acid, neonic acid, sebacic acid, and undecyl dibasic acid. One or more of the twelve carbon dibasic acids. The aluminum alloy protective agent according to claim 1, wherein the surfactant comprises one of sodium petroleum sulfonate, sorbitan oleate, fatty alcohol polyoxyethylene ether, and castor oil polyoxyethylene ether. Or a variety. The aluminum alloy protectant according to claim 1, wherein the co-emulsifier comprises one or more of ethanol, propylene glycol, and isomeric alcohol. The aluminum alloy protectant according to claim 1, wherein the rust preventive agent comprises one or more of benzotriazole, 12 alkenyl succinic acid, and oleic acid sarcosine. The patentable scope of the application of paragraph 1 protectant aluminum, wherein the aluminum alloy comprises the following weight percentages protectant ingredients: 1% -30% of CORRGUARD ^TM SI, 1% -20% of the grate Sesame oil fatty acid, 1%-10% 2-amino-2-methyl-1-propanol, 1%-10% isodecanoic acid, 0.5%-5% fatty alcohol polyoxyethylene ether, 0.5%-3 % of isomeric alcohol, 0.1% to 0.5% benzotriazole, and the balance of water. A protective agent solution comprising the aluminum alloy protectant according to claim 1 wherein the concentration of the protective agent solution is from 1% to 20%. The protectant solution of claim 9, wherein the concentration of the protectant solution is 5%.