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Preparation method of protective composite coating for hot forming of ultra-high strength steel

A technology of ultra-high-strength steel and composite coating, which is applied in the direction of coating, metal material coating technology, solid-state diffusion coating, etc., can solve the problem of single coating function, shorten the reaction time, and prevent the growth of grains , increase the effect of activity

Active Publication Date: 2020-04-28
NANJING XINGQIAO Y TEC AUTOMOBILE PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing coating has a relatively single function, the purpose of the present invention is to provide a method for preparing an ultra-high-strength steel thermoforming protective composite coating, which has a simple preparation process, stable quality, good incision protection and High temperature protection, and the surface has superhydrophobic properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, a cold-rolled low-carbon manganese-boron steel plate is used as the base material of the embodiment.

[0031] A method for preparing an ultra-high-strength steel thermoforming protective composite coating, comprising the following steps:

[0032] Step 1. Pre-treatment of the steel plate surface: degreasing, derusting, and drying pre-treatment on the surface of the ultra-high-strength steel plate;

[0033] Step 2, prepare penetrating agent: penetrating agent is made up of the raw material of following parts by weight: 20 parts of hydroxyethyl cellulose aqueous solution, 30 parts of Zn powder, 5 parts of Al powder, Cr 2 o 3 Powder 5 parts, NH 4 1 part of Cl, the mass concentration of hydroxyethyl cellulose aqueous solution is 3%; prepare the penetrant according to the above formula, and then place the slurry in a magnetic stirrer to mix evenly, the rotating speed is 300r / min, and the stirring time is 10h;

[0034] Step 3. Coating penetrating agent: ...

Embodiment 2

[0040] In this embodiment, a cold-rolled low-carbon manganese-boron steel plate is used as the base material of the embodiment.

[0041] A method for preparing an ultra-high-strength steel thermoforming protective composite coating, comprising the following steps:

[0042] Step 1. Pre-treatment of the steel plate surface: degreasing, derusting, and drying pre-treatment on the surface of the ultra-high-strength steel plate;

[0043] Step 2, prepare penetrating agent: penetrating agent is made up of the following raw materials by weight: 30 parts of hydroxyethyl cellulose aqueous solution, 40 parts of Zn powder, 15 parts of Al powder, Cr 2 o 3 Powder 10 parts, NH 4 2 parts of Cl powder, the concentration of hydroxyethyl cellulose aqueous solution is 3%; prepare the penetrant according to the above formula, and then put the slurry in a magnetic stirrer to mix evenly, the rotation speed is 500r / min, and the stirring time is 15h;

[0044] Step 3. Coating penetrating agent: Coati...

Embodiment 3

[0050] In this embodiment, a cold-rolled low-carbon manganese-boron steel plate is used as the base material of the embodiment.

[0051] A method for preparing an ultra-high-strength steel thermoforming protective composite coating, comprising the following steps:

[0052] Step 1. Pre-treatment of the steel plate surface: degreasing, derusting, and drying pre-treatment on the surface of the ultra-high-strength steel plate;

[0053] Step 2, prepare the penetrating agent: the penetrating agent is composed of the following raw materials in parts by weight: 25 parts of hydroxyethyl cellulose aqueous solution, 35 parts of Zn powder, 10 parts of Al powder, Cr 2 o 3 Powder 8 parts, NH 4 1.5 parts of Cl powder, the concentration of hydroxyethyl cellulose aqueous solution is 3%; prepare the penetrant according to the above formula, and then put the slurry in a magnetic stirrer to mix evenly, the rotation speed is 400r / min, and the stirring time is 12h;

[0054] Step 3. Coating penet...

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Abstract

The invention belongs to the technical field of metal surface treatment, and in particular, relates to a preparation method for thermal formation of a protective composite coating on ultrahigh-strength steel. The preparation method comprises surface pretreatment of a steel plate, preparation of a penetrating agent, coating of the penetrating agent, high-temperature permeation of zinc and aluminum,double-glow plasma permeation of an aluminum silicon alloy and plasma oxidation. The preparation method can form a protective coating of a four-layer structure on the surface of the ultrahigh-strength steel; the protective coating consists of a Fe-Zn and Fe-Al intermetallic compound diffusion layer, a Zn-enriched layer, an aluminum silicon alloy layer and a micro-nano oxide layer in sequence frominside to outside; the composite coating is simple in preparation process and stable in quality, and solves the difficulty of giving consideration to both high-temperature oxidation and incision corrosion resistance; and as the surface of the coating has the super-hydrophobic characteristic, the industrial production is easily realized.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a method for preparing an ultra-high-strength steel thermoforming protective composite coating. Background technique [0002] Due to its unique advantages in manufacturing cost and performance, ultra-high-strength steel has become the main way to realize the lightweight of automobiles. Compared with ordinary steel plates, ultra-high-strength steel plates have higher yield stress and tensile strength, but the hardening index, thickness anisotropy coefficient and elongation are all lower, the formability is poor, and the springback is difficult to control, and it is easy to break . Especially when the strength reaches 1500MPa, the current cold forming process can hardly complete the forming and manufacturing of ultra-high-strength steel components. In order to solve the problem of difficult forming of ultra-high-strength steel, hot-formed high-strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/14
CPCC23C10/14
Inventor 李琦吕学鹏纪沙沙王章忠巴志新李华冠张保森
Owner NANJING XINGQIAO Y TEC AUTOMOBILE PARTS CO LTD
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