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Seep-resistant coating for low-alloy structural steel part

A technology of structural steel and low alloy, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems affecting the appearance quality of the nitriding surface, etc., and achieve good seepage resistance effect, easy machining, and easy clear effect

Active Publication Date: 2010-07-14
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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AI Technical Summary

Problems solved by technology

[0003] When current low-alloy structural steel parts are subjected to nitriding heat treatment, the non-nitrided surface is protected against seepage, usually using a water glass graphite solution for protection. After using this formula, although there is a certain effect of preventing seepage, the graphite powder will float on the The surface of the workpiece affects the appearance quality of the nitriding surface, and the anti-seepage coating that is difficult to remove needs to be cleaned in time after nitriding heat treatment

Method used

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Examples

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Comparison scheme
Effect test

Embodiment

[0013] Workpiece material: 25Cr2MoV (1#~6#), 38CrMoAl (7#~9#).

[0014] The sample coated with the anti-seepage coating formula corresponding to the serial number is brought into the same furnace. Before nitriding into the furnace, the surface of the part should be completely clean and free of oil. The anti-seepage coating of the invention, when dried, has no defects such as pores and air bubbles, and the anti-seepage coating should be prepared strictly according to the formula.

[0015] Table 1 shows the results of workpieces using the anti-seepage coating formulation (by weight) of the present invention to prevent seepage.

[0016] Table 1

[0017]

[0018] It can be obtained from Table 1 that the results of the drilling and file hardness tests are good, indicating that there is no nitriding layer on the non-nitriding surface of the workpiece after nitriding heat treatment, and the measured depth of the nitriding layer is zero, and the anti-seepage effect is good;...

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Abstract

The invention relates to the chemical heat treatment process engineering of metallic materials, in particular to an anti-nitridation coating for low alloy structural steel components with the formula at the weight ratio as follows: tin powder 1, lacquer solvent 1-1.5, and Cr2O3 powder 0.1-0.2, wherein the lacquer solvent is prepared from lacquer and amyl acetate in the volume ratio of 1:1; or, the formula at the volume ratio as follows: tin powder 1, lacquer solvent 4-6, and Cr2O3 powder 0.4-0.7. The anti-nitridation coating of the invention can prevent the non-nitriding surface of the low alloy structural steel components from appearing nitrided layers in nitriding heat treatment, which facilitates the process and the use of the components for the future, and the anti-nitridation coatingis easy to remove after the component nitridation.

Description

technical field [0001] The invention relates to a metal material chemical heat treatment process technology, in particular to an anti-seepage coating for low-alloy structural steel. Background technique [0002] In steam turbines, some low-alloy structural steel parts need both good comprehensive mechanical properties and wear resistance, so it is necessary to add anti-wear nitriding heat treatment on the basis of performance heat treatment. However, according to the design requirements of the part, not all surfaces need a nitrided layer. [0003] When current low-alloy structural steel parts are subjected to nitriding heat treatment, the non-nitrided surface is protected against seepage, usually using a water glass graphite solution for protection. After using this formula, although there is a certain effect of preventing seepage, the graphite powder will float on the The surface of the workpiece affects the appearance quality of the nitriding surface, and the anti-seepage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/04
Inventor 宫力陈培新
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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