Method for performing anticorrosive hydrophobic modification on surface of aluminum alloy
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A technology of aluminum alloy surface and hydrophobic treatment, which is applied in the direction of anti-corrosion coating, metal material coating process, coating, etc., can solve the problems of high price, poor thermal conductivity, etc. Thin effect
Inactive Publication Date: 2010-11-17
BEIJING UNIV OF CHEM TECH
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In comparison, among these materials, copper and its alloys are both seawater corrosion-resistant materials and the best heat conduction materials, but the price is too expensive
Although titanium alloy and duplex stainless steel are also resistant to seawater corrosion, relatively speaking, their thermal conductivity is poor
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example 1
[0032] Aluminum alloy surface treatment: Aluminum alloy materials are degreased by hot alkaline solution, rinsed with water, and dried. Secondly, use the reductive acidic cleaning solution of the present invention (7% hydrochloric acid, 5% sulfuric acid, 3% nickel chloride, 1‰Lan-826 corrosion inhibitor, and the balance is water) to carry out surface activation treatment at normal temperature for 5 minutes. After that, rinse with water, and passivate and seal the active surface for 10 minutes to obtain a moderately rough, brown-black surface. Among them, the passivation solution is fluoride (potassium fluoride or sodium fluoride, etc.) 1‰, phosphate 1%, nitrate (potassium nitrate, sodium nitrate or ammonium nitrate, etc.) 2. The balance is water. The blocking solution is composed of 5% silicate, 1‰ cerate, and the balance is water, and the pH value is adjusted to 10.
[0033] The coating used is composed of two components, the weight ratio of components A and B is 10:1, and ...
example 2
[0036] Aluminum alloy surface treatment: Aluminum alloy materials are degreased by hot alkaline solution, rinsed with water, and dried. Secondly, use the reductive acid cleaning solution of the present invention to carry out surface activation treatment for 5 minutes (hydrochloric acid 8%, phosphoric acid 5%, reductive ferrous chloride 3%, 3‰Lan-826 corrosion inhibitor, surplus is water) . After that, rinse with water, and passivate and seal the active surface for 15 minutes to obtain a moderately rough, brown-black surface. Among them, the activated surface passivation solution is composed of 3‰ of fluoride (potassium fluoride or sodium fluoride, etc.), 3% of phosphate, 3% of chromium trioxide oxidant, and the balance is water. Phosphoric acid is used to adjust the pH value of 1 to 2 . The blocking solution is composed of 8% silicate, 1‰ cerium chloride, and the balance is water, and the pH value is adjusted to 11.
[0037] The coating used is composed of two components, t...
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Abstract
The invention discloses a method for performing anticorrosive hydrophobic modification on the surface of an aluminum alloy, which belongs to the technical field of corrosion prevention. The method specifically comprises the following steps of: (1) performing surface degreasing and oil removing on an aluminum alloy material by using conventional alkaline degreasing solution first, performing surface activation treatment by using reductive acidic cleaning solution, and then performing inactivation and sealing treatments on the activated surface; (2) preparing a composition with a hydrophobic effect, wherein the composition consists of a first component and a second component in a weight ratio of 9-16:1, the first component is prepared from the following materials in percentage by weight: 35 to 60 percent of fluorocarbon resin, 10 to 40 percent of anticorrosive pigment, 1 to 8 percent of organosilicon compound, 0.5 to 5 percent of dispersing agent, 0.5 to 3 percent of anti-settle agent and 10 to 40 percent of organic solvent, and the second component is a fatty series / aromatic series curing agent; and (3) performing anticorrosive hydrophobic modification on the surface of the aluminum alloy, namely coating the composition with the hydrophobic effect in the step (2) on the surface of the aluminum alloy after treatment in a brush coating, spray coating or dip coating mode, and curing the surface for about 12 hours. The anticorrosive hydrophobic coating layer obtained on the surface of the aluminum alloy by using the technique of the invention has the advantages of thin coating layer thickness, high adhesive force, sea water corrosion resistance, surface super-hydrophobic property and the like.
Description
technical field [0001] The invention relates to a method for anticorrosion and hydrophobic treatment on the surface of an aluminum alloy, which belongs to the technical field of anticorrosion. Background technique [0002] The shortage of fresh water resources has always plagued the development of human society. Seawater desalination is one of the ways people obtain fresh water today. In addition to using reverse osmosis devices to obtain fresh water, multi-effect flash evaporation technology is a commonly used seawater desalination process, and the quality of fresh water obtained by this technology is better. In the multi-effect flash evaporation process technology, equipment materials not only require corrosion resistance, but also require high heat transfer efficiency. At present, the corrosion-resistant metal materials used in seawater include copper and its alloys, titanium alloys, and duplex stainless steel. In comparison, among these materials, copper and its alloy...
Claims
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