Metal flange coated with insulating ceramic coating and preparation method thereof

A ceramic insulation and coating technology, applied in the direction of flange connections, mechanical equipment, pipes/pipe joints/fittings, etc., can solve the problems of reduced insulation reliability, easy failure, poor temperature resistance of organic insulation parts, etc., to prevent electric shocks Chemical corrosion, broad application prospects, high temperature resistance and electrical insulation effect

Active Publication Date: 2010-05-19
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) Low sealing reliability: insulating parts are prone to aging and damage, and have poor strength and are prone to failure, which affects the life and reliability of flange sealing;
[0011] (2) Not suitable for high temperature insulation: due to the poor temperature resistance of organic insulating parts, the operating temperature of insulating flanges generally does not exceed 300 °C;
[0012] (3) Poor insulation reliability: In addition to the easy failure of insulating parts and the reduction of insulation reliability, most of the existing technologies only insulate the end faces of flanges and fasteners, and other parts are exposed, thus increasing the distance between flanges. The danger of forming electrical conduction; this should also be the original intention of the "ship-to-shore connection insulating flange" technology to use insulating sheaths for flange flanges and apply insulating fillers between the flanges, but the use of sheaths and packing rings is undoubtedly Will increase the process and cost
[0013] (4) The corrosion of the flange by the environmental medium cannot be prevented: it is difficult to form a complete covering protective layer on the surface of the flange in the existing technology, so there is a lack of effective protection against the corrosion of the environmental medium
However, in the prior art, there is no similar patent document that achieves insulation protection by coating ceramic coatings on metal flanges

Method used

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  • Metal flange coated with insulating ceramic coating and preparation method thereof
  • Metal flange coated with insulating ceramic coating and preparation method thereof
  • Metal flange coated with insulating ceramic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take the ceramic insulating coating of the convex flange of the copper pipe section as an example.

[0041] 1) Coating composition: select 0wt% TiO 2 +100wt%Al 2 o 3 .

[0042] 2) Coating position: other appearances on the flange except the inner wall of the screw hole 5, including the back side of the flange 1, the side side of the flange 2, the front side of the flange 3 and the surface of the sealing boss.

[0043] 3) Pre-processing of the flange base: Carry out turning processing on the part of the flange to be coated. The surface roughness after processing is 2.2-2.8 μm, and the transition fillet between the end face and the side of the sealing boss is R1. 0, other transition fillets are R1.5.

[0044] 4) Plasma spraying:

[0045] ①Sandblasting pretreatment: use 100# corundum sand to blast the part to be sprayed, the surface cleanliness is Sa3 level, and the roughness is 50-75μm.

[0046] ②Adopt commercially available 0wt% TiO with a micron structure and a pa...

Embodiment 2

[0050] Take the ceramic insulating coating of the concave flange of the steel pipe section as an example.

[0051] 1) Coating composition: select 20wt% TiO 2 +80wt%Al 2 o 3 .

[0052] 2) Coating position: all appearances of the flange including the inner wall 5 of the bolt hole, that is, the rear face of the flange 1, the side face of the flange 2, the front face of the flange 3, the surface of the sealing groove and the inner wall of the screw hole 5;

[0053] 3) Flange substrate pre-processing: Carry out turning processing on the part of the flange to be coated, the surface roughness after processing is 2.0-2.6 μm, and the transition fillet between the end face and the side of the sealing groove is R1.0 , other transition fillets are R1.5.

[0054] 4) Plasma spraying:

[0055] ①Sandblasting pretreatment: use 100# corundum sand to carry out sandblasting treatment on the parts to be sprayed, the surface cleanliness is Sa3 level, and the roughness is 50-75μm.

[0056] ②Ad...

Embodiment 3

[0060] Take the ceramic insulating coating of the flat flange of the water outlet of the TC4 titanium alloy valve as an example.

[0061] 1) Coating composition: select 50wt% TiO 2 +50wt%Al 2 o 3 .

[0062] 2) Coating position: all exterior surfaces of the flange including the inner wall 5 of the bolt hole, including the rear face 1 of the flange, the side face 2 of the flange, the front face 3 of the flange, the sealing end face 4 and the inner wall 5 of the screw hole.

[0063] 3) Flange substrate pre-processing: Carry out turning processing on the part of the flange to be coated. The surface roughness after processing is 1.8-2.2 μm, and all rounded corners are R1.5.

[0064] 4) Plasma spraying:

[0065] ①Sandblasting pretreatment: use 100# corundum sand to blast the parts to be sprayed, the surface cleanliness is Sa3 level, and the roughness is 50-75μm.

[0066] ②Adopt 50wt% TiO with common commercially available micron structure and particle size of 40-75μm 2 +50wt%A...

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Abstract

The invention discloses a metal flange coated with an insulating ceramic coating and a preparation method thereof. The insulating ceramic coating comprises the following material components in percentage by weight: 0 to 50 percent of TiO2 and the balance of Al2O3, wherein the content of impurities is less than or equal to 2.0 percent. The coating position comprises all outer surfaces of a metal flange substrate. The coating has a thickness between 0.1and 0.6mm, a surface roughness less than or equal to 3.2mu m and a porosity less than 15 percent. The preparation method comprises the steps of preparing the metal flange substrate, preparing the coating and processing the coating. In the metal flange coated with the insulating ceramic coating and the preparation method thereof, dissimilar metal flanges are in a reliable electrical insulation state, electrochemical corrosion is prevented, a working temperature of the insulating flange is improved from about 300 DEG C permitted in the prior art to nearly 900 DEG C, the defects of the conventional flange insulation technology can be overcome, and the requirements of petroleum, chemical industry, electric power, ships and the like on the insulating metal flange are met.

Description

technical field [0001] The invention relates to a metal electrochemical corrosion protection and surface engineering technology, in particular to a metal flange coated with a ceramic insulating coating and a preparation method thereof. Background technique [0002] The piping systems of petroleum, chemical, electric power, ship and other facilities and equipment often have connections of dissimilar metal flanges such as valves and pipe joints. When exposed to seawater, sewage and other electrolytes or the environment is humid, galvanic corrosion will occur between heterogeneous flanges due to the difference in electrode potential, which will accelerate the corrosion of metals with lower potentials and affect the strength and sealing performance of the flanges. Flange insulation technology is to apply certain insulation measures to flanges. By increasing the resistance between flanges, the corrosion current can be significantly reduced, so as to achieve effective protection a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L23/032F16L58/14
Inventor 郗雨林张新杰王国阳石绪忠王德义
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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