A kind of phosphorus spraying film-forming liquid and phosphorus spraying process

A technology of film-forming liquid and phosphorus spraying, which is applied in the coating process of metal materials, etc., can solve the problems of tissue change and mechanical performance surface treatment difficulties, troubles in scientific research and production, and difficulties in phosphating and film formation, so as to improve tactical performance indicators and storage period, promote the level of surface technology, and improve the effect of anti-corrosion quality

Active Publication Date: 2021-01-26
HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In order to meet the requirements of product tactical performance indicators, special heat treatment is usually required to improve its mechanical properties. Due to the changes in the structure of the treatment and the improvement of mechanical properties, it brings difficulties to surface treatment. Research and tests have shown that when these alloy materials are in general state Compared with low carbon steel in this state, it is difficult to spray phosphating film formation; when its tensile strength is greater than 900MPa, phosphating film formation becomes difficult, and in order to meet the special properties of high-fragmented elastomers, its tensile strength is usually required to be greater than 1300MPa (hardness ≥ 40HRC), in this state, it is very difficult to spray phosphorus to form a film of these materials
Therefore, how to develop a phosphorus spraying process technology and formula suitable for high-strength alloy materials is very difficult, and has become a technical problem that plagues scientific research and production.

Method used

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  • A kind of phosphorus spraying film-forming liquid and phosphorus spraying process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: After degreasing and surface-conditioning the elastic body made of 35CrMnSiA and with a tensile strength of 1400MPa-1500MPa (its hardness is 41HRC-46HRC), spray phosphating treatment is carried out in the bath liquid of the following composition. The process parameters : Zn 2+ : 4000 ppm, Mn 2+ : 300 ppm, F - : 800 ppm, MoO 4 2- : 250 ppm, NO 3 - : 8000 ppm, PO 4 3- : 11000ppm. Composite accelerator (nitrite and sulfonate) A 300ppm, additive (organic salt) B 800ppm to adjust the free acid Fa of the bath: 1.0 points, the total acidity Ta: 18 points, Ta / Fa=15 or so, accelerator 5 o'clock, temperature: 43℃~45℃, pump gauge pressure: 0.04MPa~0.05MPa. Under these conditions, a light gray phosphating film layer is obtained, and the phosphating film weighs 2.5g / m 2 ~3.5g / m 2 (The drawings require not less than 1.5g / m 2 ), under 26°C environmental conditions, the copper sulfate drop test is 45s (the product drawing requires 30s); the coating is coated wit...

Embodiment 2

[0036] Example 2: After degreasing and surface conditioning, the elastic body with a material of 35CrMnSiA and a tensile strength of 1400MPa-1500MPa (hardness 41HRC-46HRC) is treated in the following spray phosphating bath. Spray phosphating process parameters: Zn 2+ : 5000ppm, Mn 2+ : 400 ppm, F - : 1000 ppm, MoO 4 2- : 300ppm, NO 3 - : 10000 ppm, PO 4 3- : 13000ppm. Composite accelerator (nitrite and sulfonate) A 400ppm, additive (organic salt) B 1000ppm, Fa: 1.4 points, Ta: 20 points Ta / Fa=15 or so, accelerator 7 points, temperature: 44℃~46 ℃, pump gauge pressure: 0.05MPa~0.06MPa. Under these conditions, a light gray phosphating film layer is obtained with a film weight of 3.5g / m 2 (Product drawings require not less than 1.5g / m 2 ), under 26°C environmental conditions, the copper sulfate spot test is 47s (30s as required by the drawing); after 96 hours of salt spray test with 5403 series military paint (coating thickness 30μm), the coating has no blistering, no ...

Embodiment 3

[0037] Example 3: After degreasing and surface conditioning, the elastic body made of 35CrMnSiA and tensile strength of 1400MPa-1500MPa (hardness 41HRC-46HRC) is treated in the following spray phosphating bath. Spray phosphating process parameters: Zn 2+ : 6000ppm, Mn 2+ : 450 ppm, F - : 1200 ppm, MoO 4 2- : 350ppm, NO 3 - : 12000 ppm, PO 4 3- : 16000ppm. Composite accelerator (nitrite and sulfonate) A 600ppm, additive (organic salt) B 1200ppm, Fa: 1.8 points, Ta: 26 points Ta / Fa=15 or so, accelerator 9 points, temperature: 46℃~ 48°C, pump gauge pressure: 0.06MPa~0.07MPa. Under these conditions, a gray phosphating film with a film weight of 3.5g / m 2 (Product drawings require not less than 1.5g / m 2 ), under 26°C environmental conditions, the copper sulfate spot test is 50s (the product drawing requires 30s); after 96 hours of salt spray test with 5403 series military paint (coating thickness 30μm), the coating does not blister, fall off, or Rust (the product pictur...

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Abstract

The invention discloses a novel phosphorus-spraying film-forming liquid and its process for spraying phosphorus. The phosphorus-spraying film-forming liquid is composed of raw materials with the following mass ratios: Zn 2+ : 3000PPm~6000PPm, Mn 2+ : 300PPm~600PPm, F ‑ : 600PPm~1200PPm, MoO 4 2‑ : 250PPm~500PPm, NO 3 ‑ : 8000PPm~15000PPm, PO 4 3‑ : 11000PPm~19000PPm, composite accelerator A 300PPm~900PPm, additive B 600PPm~1200PPm, the balance is water, of which PPm is one millionth, and adjust the free acid, total acidity and acid ratio of the bath to control Temperature, pump pressure, nozzle spray density and spray time. The invention solves the difficulty of spraying and phosphating the high-strength steel projectiles and parts of missile products, improves the anti-corrosion performance of missile products, thereby ensuring the effectiveness of missile products and prolonging their service life to ensure national defense security. Realize automatic production, improve production efficiency, and meet the requirements of lean production and clean production advocated by the state.

Description

technical field [0001] The invention belongs to the technical field of materials and chemical engineering, and in particular relates to a phosphorus spraying process technology and formula of high-strength alloy materials, and in particular to a phosphorus spraying film-forming liquid and a phosphorus spraying process thereof. Background technique [0002] Spray phosphating (referred to as phosphorus spraying) is an important process before painting, and its purpose is to improve the passivity of the base material and the adhesion and corrosion resistance of the coating. Phosphorus spraying technology is widely used, but most of them are only suitable for low-strength and low-carbon steel Q175, Q235, 45#, etc., which are easy to form films, such as vehicle body, bridge frame and home appliance shell. Due to the special functional requirements of military products, many of its components are mostly made of high-strength alloy steel, and there is almost no phosphorus spraying ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/76C23C22/44
CPCC23C22/44C23C22/76
Inventor 庞留样白新燕杨有才杨成
Owner HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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