Laser remelting method for steel electric arc spraying aluminum coating layer used for ocean platform
A technology of arc spraying and offshore platform, which is applied in the direction of coating, metal material coating process, fusion spraying, etc. It can solve the problems of affecting the mechanical properties of load-bearing devices, reducing the service life, and accelerating the corrosion rate, etc., to achieve long-term protection, The effect of uniform thickness and increased service life
Active Publication Date: 2015-09-23
CHANGZHOU UNIV
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[0002] Offshore platforms are mainly used in the exploitation of offshore oil and natural gas. Due to the continuous development of oil and gas exploration areas to deep sea areas, offshore platforms will be subjected to more severe physical and chemical corrosion such as typhoons, waves, tides, salt spray, electrolytes, and marine microorganisms; Especially in the wave splash area, the corrosion rate of steel is 6 times that of normal conditions. A small amount of damage to the steel surface of the pile legs will lead to the generation of closed batteries, which will accelerate its corrosion rate, and the application of mobile offshore platforms has a great impact on offshore platforms. The anti-corrosion period puts forward new requirements; arc spraying aluminu
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[0009] (1) use 180 # -1000 # Grind the surface of the substrate with sandpaper, clean it with absolute ethanol, and degrease with acetone to remove the grease and sundries on the surface of the sample to ensure that the surface cleanliness of the substrate reaches Sa3 level.
[0010] (2) Use cast iron sand with a particle size of 1mm as abrasive grains, compressed air pressure > 0.8MPa, sandblasting distance of 200mm, and sandblasting angle of 20°, so that the roughness can reach RZ60μm.
[0011] (3) Use industrial Ф2mm aluminum wire as raw material to ensure its purity > 99.5%, use the heat energy of the arc to heat the aluminum wire to a molten state, the working voltage is 20-32V, the current is 150-300A, and the temperature is 0.5-0.6Mpa The high-pressure airflow is used as the power to spray molten aluminum onto the surface of the substrate, ensuring that the moving speed of the spray gun is 300-400mm / s, and the spraying distance is 5-8mm. After the spraying is completed...
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The invention relates to the technical field of steel surface modification processing, in particular to a laser remelting method for a steel electric arc spraying aluminum coating layer used for an ocean platform, in order to solve the problem that the seawater corrosion resistant capacity of the coating layer is improved without increasing the thickness of the coating layer, and belongs to a material surface modification composite processing technology. By means of a electric arc spraying technology, a layer of the aluminum coating layer is prepared by using the surface of a steel base material on the ocean platform, then a laser remelting technology is used to iron melt the aluminum coating layer and the surface of a substrate, and after cooling is conducted, a Fe-Al alloy layer is formed; the surface of the coating layer is flat, the structure property can be improved, alloy combination is formed between the coating layer and the base material, a few amorphous state aluminum is generated in the coating layer, and the corrosion resistant performance of the coating layer can be improved.
Description
technical field [0001] The invention relates to the technical field of steel surface modification treatment for offshore platforms, in particular to a laser remelting method for arc spraying aluminum coatings on steel surfaces for offshore platforms, in order to solve the problem of improving the seawater corrosion resistance of the coating without increasing the thickness of the coating The problem belongs to the composite treatment technology of material surface modification. Background technique [0002] Offshore platforms are mainly used in the exploitation of offshore oil and natural gas. Due to the continuous development of oil and gas exploration areas to deep sea areas, offshore platforms will be subject to more severe physical and chemical corrosion such as typhoons, waves, tides, salt spray, electrolytes, and marine microorganisms; Especially in the wave splash area, the corrosion rate of steel is 6 times that of normal conditions, and a small amount of dam...
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Inventor 孔德军董学泉王文昌汤成建赵本国盛天源
Owner CHANGZHOU UNIV
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