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Evaluation method for sealing agent of thermal spraying coating

An evaluation method and technology of sealing agent, applied in the direction of coating, metal material coating process, molten spraying, etc., can solve the problems of long test period, corrosion resistance, cumbersome test preparation, etc., to achieve verification of heat resistance, Increase the effect of heating equipment

Inactive Publication Date: 2014-04-23
JIANGHAN MASCH RES INST LTD CO OF CNPC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of salt spray corrosion evaluation coating sealant is that the test period is long (the thermal spray coating has strong corrosion resistance, generally takes one month), the test preparation is cumbersome, and the non-coated surface needs to be shielded from corrosion treatment, so as not to affect the test results; during the test, it is necessary to ensure that the spray is uninterrupted, and the pH value of the solution must be monitored at any time. When it exceeds the range, it needs to be adjusted with chemical reagents

Method used

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  • Evaluation method for sealing agent of thermal spraying coating
  • Evaluation method for sealing agent of thermal spraying coating
  • Evaluation method for sealing agent of thermal spraying coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides three kinds of sealing agents and evaluation examples with unsealed coating as a reference. The specific process is as follows:

[0043] ①. Insulation coating preparation, AT20 spray powder is selected, and plasma spraying equipment is used for spraying. The spraying parameters are: I: 700A, Ar: 45psi, H 2 : 70psi, carrier gas: 50psi, powder disc speed: 3.0 rpm, gun distance: 95mm. Coating thickness 0.30mm, four pieces in total.

[0044] ②, Sealing treatment, the three sealing agents of alkyd varnish, amino alkyd, and polytetrafluoroethylene are used for sealing treatment according to the instructions, and the next step is performed after thorough curing.

[0045] ③. Polishing treatment. Polishing treatment is performed on the cured sample and the unsealed sample, and the coating is polished off by about 0.1mm.

[0046] ④ Soaking, soak the four polished samples in 5% NaCl solution for 2 hours.

[0047] ⑤. Measurement: Wipe the soaked sample cle...

Embodiment 2

[0050] Same as embodiment 1, but in its step 1, the insulating coating selects AT13 spraying powder for use, and concrete composition is: TiO 2 : 13.0%, Al 2 o 3 :margin. The coating thickness is 0.5 mm, and the coating thickness after polishing is 0.4 mm.

[0051] The evaluation part of step 6 is as follows:

[0052] The resistance of the unsealed sample after immersion is 0-2 megohm, the resistance of the polytetrafluoroethylene sample is 3-5 megohm, the alkyd varnish sample is 8-30 megohm, and the amino alkyd is 40 ~65 megohms. Taking 5 megohms as the critical resistance value, it can be considered that the two sealing agents, alkyd varnish and amino alkyd, meet the requirements for coating use, and amino alkyd is better than alkyd varnish.

Embodiment 3

[0054] Same as Example 1, but the thickness of the coating in step 1 is 0.4 mm; the coating is polished off by about 0.15 mm in step 3.

[0055] The evaluation part of step 6 is as follows:

[0056] The resistance of the unsealed sample after immersion is 0-0.5 megohm, the resistance of the polytetrafluoroethylene sample is 1-5 megohm, the alkyd varnish sample is 6-20 megohm, and the amino alkyd is 30-20 megohm. 55 megohms. Taking 5 megohms as the critical resistance value, it can be considered that the two sealing agents, alkyd varnish and amino alkyd, meet the requirements for coating use, and amino alkyd is better than alkyd varnish.

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Abstract

The invention discloses an evaluation method for a sealing agent of a thermal spraying coating. The evaluation method comprises the following steps: (1) spraying an insulating coating on the surface of test paper by using plasma spraying equipment, wherein a base material of the test sample is a conductive material and the coating is an insulating material; (2) carrying out sealing treatment on the insulating coating on the surface of the test sample by using an insulating sealing agent; (3) carrying out polishing treatment on the sealed coating; (4) carrying out immersion treatment on the polished coating; (5) wiping the immersed coating and measuring the resistance between a base body and the coating by using a resistance measuring meter; and (6) judging the sealing effect of the sealing agent according to the measured resistance. The evaluation method disclosed by the invention can be used for simply and rapidly judging the advantages and the disadvantages of the sealing agent; the evaluation can be given within three hours after the sample is sealed; monitoring on the change of the surface of the sample, complicated equipment and a long testing period are not needed; and the evaluation method is simple and convenient to implement, is short in operation period and is clearly defined.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and more particularly relates to an evaluation method of a thermal spray coating sealing agent. Background technique [0002] At present, there are two main evaluation methods for sealing agents commonly used: 1. Immersion corrosion evaluation, soak the sealed sample in acid, alkali or salt solution (or the environmental medium solution for the actual application of the coating), after a certain period of time Finally, observe the color change of the sample or solution due to corrosion, and record the time when the change occurs, and judge the effectiveness of the sealing agent according to the length of time. The main disadvantage of this method is that the time for the color change of the sample or solution is not clearly defined, and some corrosion may not necessarily produce a color change, which is likely to cause inaccurate evaluation, and it needs to continue to observe the chang...

Claims

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Application Information

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IPC IPC(8): G01N27/04C23C4/18
Inventor 任武贺会群谭文锋袁文才石成刚罗刚
Owner JIANGHAN MASCH RES INST LTD CO OF CNPC
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