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Zinc alloy coating of LNG (Liquefied Natural Gas) opening-frame vaporizer

An open-frame gasifier, zinc alloy technology, applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of no patents, etc., to prolong the service life, good erosion and corrosion resistance, and improve the forming performance effect

Active Publication Date: 2013-11-27
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, there are no related patents or published materials on Z

Method used

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  • Zinc alloy coating of LNG (Liquefied Natural Gas) opening-frame vaporizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Zn-Al master alloy, Al-Cu master alloy, Al-Y master alloy, and pure Zn particles are distributed according to the chemical composition Al 5.3wt%, Cu4.0wt%, Y 0.5wt%, and the balance is the target composition of Zn, through Alloy ingots are produced by smelting. The ingot is extruded and drawn to make Ф3mm Zn-Al-Cu wire, and a long-term sacrificial anode coating is sprayed on the aluminum alloy by thermal spraying. The corrosion potential, microhardness, thickness, and Corrosion rates are shown in Table 1.

Embodiment 2

[0025] The Zn-Al master alloy, Al-Cu master alloy, Al-Y master alloy, and pure Zn particles are prepared by mechanical mixing according to the target ingredients of the chemical composition Al 35.4wt%, Cu6.2wt%, and the balance being Zn. Pseudo-alloy powder. The pseudo-alloy powder was cold sprayed on the aluminum alloy substrate to prepare a long-lasting sacrificial anode coating. The corrosion potential, microhardness, thickness and corrosion rate of the coating in seawater are shown in Table 1.

Embodiment 3

[0027] The Zn-Al master alloy, Al-Cu master alloy, Al-Y master alloy, and pure Zn particles are distributed according to the chemical composition Al 20.3wt%, Y 5.1wt%, and the balance is Zn, and the alloy ingot is prepared by , the ingot is made into Ф3mm Zn-Al-Cu wire after extrusion and wire drawing, and a long-term sacrificial anode coating is prepared on the aluminum alloy by thermal spraying. The corrosion potential, microhardness and thickness of the coating in seawater , The corrosion rate is shown in Table 1.

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Abstract

The invention discloses a zinc alloy coating of an LNG (Liquefied Natural Gas) opening-frame vaporizer. The coating is made of a zinc alloy material comprising the following chemical components: 5.3-35.4wt% of Al, 0-6.2wt% of Cu, 0-5.1wt% of Y and the balance of Zn. According to the invention, Zn is used as a matrix, and Al and Cu are used as main alloy elements; Zn is used as the matrix so as to play a favorable protecting role for a cathode; Al can be formed into a compact Al2O3 protective film so as to ensure that the coating has certain seawater corrosion resistance; due to the addition of Cu, the coating is higher in hardness and better in erosion corrosion resistance, and the corrosion resistance of the coating can also be improved. Due to the addition of Y, not only can the corrosion resistance of the coating be improved, but also the forming performance of the material can be improved, so that the material can be more conveniently prepared into the corrosion resistant coating.

Description

technical field [0001] The invention belongs to the technical field of coating materials for gasifiers, in particular to a zinc alloy material coating for an LNG open-frame gasifier. Background technique [0002] Natural gas is a high-quality, high-efficiency, and clean energy. Its proportion in the world's energy consumption structure has rapidly increased from 10% in 1950 to 24% at present, becoming the third largest energy source in the world. In practical applications, LNG (Liquefied Natural Gas) is the main form of storage and transportation. Before use, LNG must be gasified by a gasifier, and finally turned into normal temperature natural gas, which is transported to users in a gaseous state through pipelines . Therefore, the LNG gasifier is the key equipment in the whole LNG supply process. At present, the super open-frame gasifier is usually used. The open-frame gasifier uses natural seawater as the heating medium, which has direct sources, abundant resources, and ...

Claims

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Application Information

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IPC IPC(8): C23C30/00C23C4/08C23C24/00C22C18/04
Inventor 张斌斌李兆峰李培跃
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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