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A kind of boronizing agent and boronizing process for low-temperature electrolytic boronizing

A boronizing agent and boronizing technology, applied in the field of metal surface treatment, can solve problems such as uneven infiltration layer, large energy consumption, large workpiece deformation, etc., achieve low boronizing operating temperature, wide application range, and low initial crystal temperature Effect

Inactive Publication Date: 2017-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common boronizing methods include solid boronizing, salt bath boronizing, gas boronizing, plasma boronizing, etc. Most of the industrial applications are limited to solid boronizing, and the above processes all have high processing temperature (higher than 850°C) ), non-uniform permeation layer, boronizing agent can not be recycled, hard to clean the surface attachments after boronizing, high requirements on boronizing atmosphere environment (such as: low oxygen partial pressure), unable to mass-produce, high energy consumption, etc.
In addition, the boronizing temperature of traditional metal electrolytic boronizing is relatively high, generally at 850-1300°C. Under this high-temperature condition, the workpiece will deform greatly and the structure will be coarsened, which is difficult to meet the performance requirements of precision parts. In addition, at high temperature The obtained infiltrated layer is brittle and has weak bonding force with the matrix

Method used

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  • A kind of boronizing agent and boronizing process for low-temperature electrolytic boronizing
  • A kind of boronizing agent and boronizing process for low-temperature electrolytic boronizing
  • A kind of boronizing agent and boronizing process for low-temperature electrolytic boronizing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the boronizing agent used is NaBF 4 , B 2 o 3 and CaCl 2 .

[0036] Table 1 Embodiment 1 Low-temperature boriding agent raw material ratio

[0037] Element NaBF 4

B 2 o 3

CaCl 2

Content (wt.%) 77 15 8

[0038] (1) Preparation of boronizing agent

[0039] Weigh the above-mentioned dried components according to the proportion, mix them evenly, and set aside.

[0040] (2) Metal surface pretreatment

[0041] Titanium plate (TA1) is selected as the boronizing workpiece, the size of the titanium plate is 30×20×2.5mm, and 180 # 、400 # 、600 # , 800 # 、1000 # , 1200 # Mechanically polish the workpiece with metallographic sandpaper to remove the surface oxide layer, then clean the workpiece with deionized water, then place the workpiece in an ultrasonic cleaner and clean it with acetone for 20 minutes, and finally rinse it with deionized water and dry it ,stand-by;

[0042] (3) Boronizing treatment

[004...

Embodiment 2

[0046] The composition of the boronizing agent used is NaBF 4 , B 2 o 3 and NaCl.

[0047] Table 2 Embodiment 2 raw material proportioning

[0048] Element NaBF 4

B 2 o 3

NaCl Content (wt.%) 85 10 5

[0049] (1) Preparation of boronizing agent

[0050] Weigh the above-mentioned dried components according to the proportion, mix them evenly, and set aside.

[0051] (2) Metal surface pretreatment

[0052] Choose low-carbon steel plate (Q235) as the boronizing workpiece, the size of the workpiece is 30×20×5mm, and use 180 # 、400 # 、600 # , 800 # 、1000 # , 1200 # Mechanically polish the workpiece with metallographic sandpaper to remove the surface oxide layer, then clean the workpiece with deionized water, then place the workpiece in an ultrasonic cleaner and clean it with acetone for 30 minutes, and finally rinse it with deionized water and dry it ,stand-by;

[0053] (3) Boronizing treatment

[0054] Put the prepared boronizing a...

Embodiment 3

[0057] The composition of the boronizing agent used is NaBF 4 , B 2 o 3 , KCl and NaF.

[0058] Table 3 Embodiment 3 raw material proportioning

[0059] Element NaBF 4

B 2 o 3

KCl NaF Content (wt.%) 80 10 5 5

[0060] (1) Preparation of boronizing agent

[0061] Weigh the above-mentioned dried components according to the proportion, mix them evenly, and set aside

[0062] (2) Metal surface pretreatment

[0063] Titanium plate (TA1) is selected as the boronizing workpiece, the workpiece size is 30×20×2.5mm, and 180 # 、400 # 、600 # , 800 # 、1000 # , 1200 # Mechanically polish the workpiece with metallographic sandpaper to remove the surface oxide layer, then clean the workpiece with deionized water, then place the workpiece in an ultrasonic cleaner and clean it with acetone for 25 minutes, and finally rinse it with deionized water and dry it ,stand-by;

[0064] (3) Boronizing treatment

[0065] Put the dried boronizing agent...

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Abstract

The invention discloses a boriding medium and a boriding process for metal surface low-temperature electrolytic boriding. The boriding medium consists of the following components: 65-98.9wt.% of NaBF4, 1-20wt.% of B2O3 and 0.1-15wt.% of an additive. The boriding process comprises the following steps: during boriding treatment, adding the prepared boriding medium into a crucible, putting the crucible into a resistance furnace or a frequency furnace, taking a metal workpiece as a cathode, taking a graphite material as an anode, heating to the temperature of 450-850 DEG C, preserving the temperature, conducting direct current after the boriding medium is completely melted, controlling the current density to be 50-800mA.cm<-2>, electrolyzing for 0.5-12 hours, cutting off the power, taking out the metal workpiece from the boriding medium melt, cooling in a proper mode, and cleaning the attached electrolyte. The boriding medium disclosed by the invention has the characteristics of high molten state fluidity, high conductivity, repeated utilization and simplicity in separation from the metal workpiece; and moreover, the boriding process is low in energy consumption, the operating temperature is low, and boriding treatment of some low-melting-point metals and alloys thereof can be realized.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a boronizing agent for molten salt electrolytic boronizing on metal surfaces and a boronizing process. Background technique [0002] Metal materials play a vital role in human production and life. During the use of metal materials, due to wear, corrosion and oxidation loss, the amount of metal loss and waste is huge every year. In order to improve the wear resistance and Corrosion resistance, people have adopted a variety of surface modification technology. The borides of many metals are compounds with high melting point, high hardness and strong corrosion resistance. The boronized layer obtained by boronizing not only has high hardness and good wear resistance, but also has good corrosion resistance and high temperature resistance, so people Boronizing is commonly used to improve the surface properties of metal materials. [0003] At present, the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/08C25D3/66
Inventor 吕晓军胡凌云李劼
Owner CENT SOUTH UNIV