Surface treating method for sea water corrosion-resistant metal aluminum or aluminum alloy

Abstract

The invention relates to a method for treating the surface of seawater corrosion resistant metallic aluminum or aluminum alloy. The method comprises the following steps: 1) sand pellets are used to carry out gritting blasting treatment for the surfaces of aluminum and aluminium alloy through a spray gun so as to bring about the concave and convex surface topography in the micron order for aluminium and aluminium alloy; 2 the aluminium and aluminium alloy is cleaned after degreasing and is taken as the anode of an electrolytic bath, and nickel is taken as a cathode; the electrolyte is prepared and is added into the electrolytic bath, and a DC power supply is connected with the anode and the cathode so as to form nanometer holes on the aluminium or aluminium alloy surface; and 3 silicon fluoride is taken to carry out the surface finish of aluminum or aluminium alloy so as to reduce the surface free energy of aluminium or aluminium alloy. The method for adopting silicone fluoride to carry out the surface finish of aluminum or aluminium alloy comprises the following steps: heating up the aluminium or aluminium alloy processed in step 2 to 90 to 120 DEG C, keeping the temperature for 30 to 40 minutes, taking the aluminium or aluminum alloy out and cooling down the aluminium or aluminum alloy to a room temperature, and then carrying out surface finish through a soak method or a vapor plating method. The processed aluminium metal or aluminum alloy has good resistance to seawater corrosion.

Description

technical field [0001] This field relates to a surface treatment method for improving the seawater corrosion resistance of metal aluminum and aluminum alloys, especially adopting surface sand blasting treatment and anodic oxidation treatment to construct a micro-nano secondary structure, and then modifying it with low surface energy substances to reduce Its surface free energy can obtain a super-hydrophobic surface and improve the seawater corrosion resistance of metal aluminum and aluminum alloys. Background technique [0002] Seawater is a strong corrosive medium with high salinity, which has a strong corrosive effect on general metals. For a long time, people have chosen titanium and copper-nickel alloys as seawater corrosion-resistant materials. Titanium has high corrosion resistance, but it has poor thermal conductivity, is expensive, and is not easy to process; copper-nickel alloys are prone to contact electrochemical corrosion. All countries in the world attach great...

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Problems solved by technology

However, these methods have certain problems

For example, the electrochemical deposition method is not easy to operate due to the limitation of current and energization time; the solvent-non-solvent method is relatively harsh in the selection of solvents and non-solvents, and it is difficult to find suitable solvents and non-solvents; However, the preparation of suitable templates that can be reused has become the bottleneck of this technology; the plasma treatment method is difficult to achieve industrial production in terms of equipment and instruments

In addition, in some methods that are expected to realize industrial production, there is a defect that the hydrophobic performance is not excellent enough, such as the sandblasting treatment mentioned in the article "Methods for Improving the Surface Hydrophobicity of Metal Materials" (patent CN200610038572.4) by Xiao Yi et al. method, because the microstructure formed by the sandblasting treatment is at the micron level, when the water droplet touches the solid surface, it is easy to fall into the pit, which makes the contact angle hysteresis serious.

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