A surface treatment method for preventing high-strength bolts from corroding and sticking

A high-strength bolt and surface treatment technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem of inability to improve the anti-sticking performance of bolts, reduce the number of times of making and unloading bolts, and reduce the service life of bolts To achieve uniform and stable quality, ensure product quality, and reduce temperature difference

Active Publication Date: 2020-04-03
湖南红宇智能制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the fields of petrochemical, marine engineering equipment, and rail transit, a large number of high-strength bolts are used. At present, high-strength bolts face two major problems: corrosion and sticking. Reduced make-up and breakout times
The two major defects of high-strength bolts will cause a huge waste of materials and labor in the above-mentioned engineering applications
At present, the methods to improve the corrosion resistance of high-strength bolts mainly include: dacromet, zinc-nickel co-infiltration, zinc sherification, blackening and other treatment methods. These methods can improve the corrosion resistance of high-strength bolts, but they cannot improve the corrosion resistance of bolts. Sticking property, and there is no treatment method in the prior art that can simultaneously improve the corrosion resistance and sticking resistance of high-strength bolts

Method used

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  • A surface treatment method for preventing high-strength bolts from corroding and sticking
  • A surface treatment method for preventing high-strength bolts from corroding and sticking
  • A surface treatment method for preventing high-strength bolts from corroding and sticking

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A surface treatment method for preventing corrosion and fastening of high-strength bolts, comprising the following steps:

[0030] (1) Cleaning: Pre-clean the high-strength bolts (grade 10.9) made of 40Cr, remove the oil and rust on the surface of the high-strength bolts, and then install the clamps to install the high-strength bolts into the tooling;

[0031] (2) Preheating: Put the high-strength bolts into the air heating tank, raise the temperature to 305±5°C at a rate of 5°C / min, and keep it warm for 10 minutes;

[0032] (3) Carbon nitrogen lanthanum yttrium ion infiltration: put the preheated high-strength bolts into the carbon nitrogen lanthanum yttrium ion infiltration tank, use carbon nitrogen lanthanum yttrium ion infiltration agent to carry out carbon nitrogen lanthanum yttrium ion infiltration treatment, the temperature is 425± 5°C, the time is 160 minutes; the lanthanum carbonitride yttrium ionizing agent includes the following components in weight percentag...

Embodiment 2

[0041] A surface treatment method for preventing corrosion and fastening of high-strength bolts, comprising the following steps:

[0042] (1) Preheating: Put the high-strength bolts (grade 12.9) made of 42CrMo into the air heating tank, raise the temperature to 345±5°C at a speed of 10°C / min, and keep it warm for 15 minutes;

[0043] (2) Carbon nitrogen lanthanum yttrium ion infiltration: put the preheated high-strength bolts into the carbon nitrogen lanthanum yttrium ion infiltration tank, use the carbon nitrogen lanthanum yttrium ion infiltration agent to carry out the carbon nitrogen lanthanum yttrium ion infiltration treatment, the temperature is 455± 5°C, the time is 180 minutes; the lanthanum carbonitride yttrium ionizing agent includes the following components in weight percentage: KOCN 40%, NaHCO 3 18%, NaOH 22%, NH 4 Cl5%, NaNO 2 2%, Sr(OH) 2 2%, Ce(NO 3 ) 3 ·6H 2 O 1%, YbCl 3 0.02%, Li 2 B 4 o 7 8%, ErCl 3 ·6H 2 O1.4%, YCl 3 0.05%, La 2 (CO 3 ) ...

Embodiment 3

[0052] A surface treatment method for preventing corrosion and fastening of high-strength bolts, comprising the following steps:

[0053] (1) Preheating: Put the high-strength bolts (grade 14.9) made of 38CrMoAl into the air heating tank, raise the temperature to 345±5°C at a speed of 10°C / min, and keep it warm for 15 minutes;

[0054] (2) Carbon nitrogen lanthanum yttrium ion infiltration: Put the preheated high-strength bolts into the carbon nitrogen lanthanum yttrium ion infiltration tank, use carbon nitrogen lanthanum yttrium ion infiltration agent to carry out carbon nitrogen lanthanum yttrium ion infiltration treatment, the temperature is 475± 5°C, the time is 200 minutes; the lanthanum carbonitride yttrium ionizing agent includes the following components in weight percentage: KOCN 36%, NaHCO 3 20%, NaOH 25%, NH 4 Cl4%, NaNO 2 2%, Sr(OH) 2 2%, Ce(NO 3 ) 3 ·6H 2 O 2%, YbCl 3 0.01%, Li 2 B 4 o 7 7%, ErCl 3 ·6H 2 O1%, YCl 3 0.1%, La 2 (CO 3 ) 3 0.89%;...

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Abstract

The invention discloses a surface treatment method capable of preventing a high-strength bolt from corrosion and thread gluing. According to the surface treatment method, a carbon nitrogen lanthanum yttrium ion seeping agent, a lanthanum yttrium activation seeping agent and an oxygen ion seeping agent are utilized to seep non-metallic elements and trace metal elements into the surface of a high-strength bolt substrate so as to form a compound layer and a metal oxidation layer, so that a wearing layer is formed on the surface of the high-strength bolt substrate, the service life of the high-strength bolt is greatly prolonged, the corrosion resistance of the high-strength bolt is also improved; and the high-strength bolt has high mechanical property, and the precision of the high-strength bolt is not affected by the surface treatment. The seeping agents are low in melting point and high in stability; and the ions are cooperated with each other, so that the seeping effect can be effectively ensured to ensure the product quality.

Description

technical field [0001] The invention relates to the field of fastener processing, in particular to a surface treatment method for preventing corrosion and fastening of high-strength bolts. Background technique [0002] In the fields of petrochemical, marine engineering equipment, and rail transit, a large number of high-strength bolts are used. At present, high-strength bolts face two major problems: corrosion and sticking. The number of make-up and breakout is reduced. The two major defects of high-strength bolts will cause huge waste of materials and labor in the above-mentioned engineering applications. At present, the methods to improve the corrosion resistance of high-strength bolts mainly include: dacromet, zinc-nickel co-infiltration, zinc sherification, blackening and other treatment methods. These methods can improve the corrosion resistance of high-strength bolts, but they cannot improve the corrosion resistance of bolts. Sticking properties, and there is no trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 罗德福陈甥怡黄虎
Owner 湖南红宇智能制造有限公司
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