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High-strength steel and hard aluminum alloy combined body spraying phosphorization technology

A hard aluminum alloy and high-strength steel technology, which is applied in the field of spray phosphating process of high-strength steel and hard aluminum alloy combination, can solve the problem of affecting product tactical performance index and storage period, large difference in film quality on the surface of different metals, Difficulty in the same tank, synchronous spraying and phosphating film formation, etc., to achieve the effect of promoting the improvement of the surface technology level, easy film formation, and improving the quality of surface treatment

Active Publication Date: 2020-01-17
HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the purpose of the present invention is to provide a high-strength steel and hard aluminum alloy combination spray phosphating process, to solve the problem that the combined projectile composed of high-strength alloy steel and hard aluminum alloy of a certain smart product is difficult to be in the same tank. , Simultaneous spraying and phosphating film formation, resulting in large differences in the quality of film formation on the surface of different metals, resulting in a decrease in anti-corrosion level, thus affecting the tactical performance index and storage cycle of the product

Method used

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  • High-strength steel and hard aluminum alloy combined body spraying phosphorization technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The alloy steel with a hardness of 42HRC-47HRC and a material of 30CrMnSiA and a hard aluminum alloy 2A12 sample are riveted together, and after degreasing and surface conditioning treatment, spray phosphating treatment in a bath composed of the following composition: Zn 2+ : 4000PPm, Mn 2+ : 500PPm, Fe 2+ : 400PPm, MoO 4 2- : 300PPm, NO 3 - : 9000PPm, PO 4 3- : 12000PPm, SO 4 2- : 400PPm. Composite accelerator (the ratio of fluorosilicate and cobalt salt is 2:1) 900PPm, composite accelerator (the ratio of nitrite and nitro compound is 3:1) 300PPm. Free acidity (Fa): 0.8 points, total acidity (Ta): 18 points, Ta / Fa=22.5; bath temperature: 40°C, pump gauge pressure: 0.04MPa, nozzle spray density 130L / m 2 Min, spray time 3min.

[0037] Under these conditions, the color of the obtained high-strength steel film layer is light gray to dark gray, and the phosphating film layer of hard aluminum alloy is light gray;

[0038] a. Phosphating film weight: 2.4g / m, coppe...

Embodiment 2

[0043] The alloy steel with a hardness of 41HRC-46HRC and a material of 30CrMnSiA and a hard aluminum alloy 2A12 sample are riveted together, and after degreasing and surface conditioning treatment, spray phosphating treatment in a bath composed of the following composition: Zn 2+ : 5000PPm, Mn 2+ : 700PPm, Fe 2+ : 500PPm, MoO 4 2- : 400PPm, NO 3 - : 12000PPm, PO 4 3- : 15000PPm, SO 4 2- : 550PPm. Composite accelerator (the ratio of fluorosilicate and cobalt salt is 2:1) 1200PPm, composite accelerator (the ratio of nitrite and nitro compound is 3:1) 450PPm. Free acidity (Fa): 1.2 points, total acidity (Ta): 22 points, Ta / Fa=18; bath temperature: 44°C, pump gauge pressure: 0.07MPa, nozzle spray density 170L / m 2 min, spray time 6min.

[0044] Under these conditions, the color of the obtained high-strength steel film layer is light gray to dark gray, and the phosphating film layer of hard aluminum alloy is light gray;

[0045] a. Phosphating film weight: 4g / m2, copper...

Embodiment 3

[0050] The alloy steel with a hardness of 42HRC-47HRC and a material of 30CrMnSiA and a hard aluminum alloy 2A12 sample are riveted together, and after degreasing and surface conditioning treatment, spray phosphating treatment in a bath composed of the following composition: Zn 2+ : 6000PPm, Mn 2+ : 800PPm, Fe 2+ : 600PPm, MoO 4 2- : 500PPm, NO 3 - : 15000PPm, PO 4 3- : 18000PPm, SO 4 2- : 700PPm. Composite accelerator (the ratio of fluorosilicate and cobalt salt is 2:1) 1500PPm, composite accelerator (the ratio of nitrite and nitro compound is 3:1) 600PPm. Free acidity (Fa): 1.6 points, total acidity (Ta): 26 points, Ta / Fa=16.3; bath temperature: 48°C, pump gauge pressure: 0.09MPa, nozzle spray density 190L / m 2 min, spray time 4min.

[0051] Under these conditions, the color of the obtained high-strength steel film layer is light gray to dark gray, and the phosphating film layer of hard aluminum alloy is light gray;

[0052] a. Phosphating film weight: 3.7g / m, cop...

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Abstract

The invention discloses a high-strength steel and hard aluminum alloy combined body spraying phosphorization technology. According to a treated high-strength steel and hard aluminum alloy combined body, according to the technology process, spraying phosphorization treatment is conducted in a spraying phosphorization bath solution prepared according to the proportion, and spraying phosphorization liquid components include 4000 PPm-6000 PPm of Zn<2+>, 500 PPm-800 PPm of Mn<2+>, 400 PPm-600 PPm of Fe<2+>, 300 PPm-500 PPm of MoO4<2->, 9000 PPm-15000 PPm of NO3<->, 12000 PPm-18000 PPm of PO4<3->, 400 PPm-700 PPm of SO4<2->, 900 PPm-1500 PPm of a composite accelerator, 300 PPm-600 PPm of a composite accelerant and the balance water, wherein PPm is the one in a million and is a mass ratio, the color of an obtained high-strength steel film layer is light gray to dark gray, and the hard aluminum alloy phosphorization film layer is light gray. The high-strength steel and hard aluminum alloy combined body spraying phosphorization technology solves the problems that according to a combined projectile body composed of high-strength aluminum steel and a hard aluminum alloy for an intelligent product, same-tank and synchronous spraying phosphorization for film forming is difficult, consequently, the product dissimilar metal surface film forming quality difference is large, the corrosion preventing level is lowered, and accordingly the product tactics performance index and the storage period are influenced.

Description

technical field [0001] The invention relates to the field of material and applied chemical process technology, in particular to a spray phosphating process for a combination of high-strength steel and hard aluminum alloy. Background technique [0002] According to different construction methods, phosphating can be divided into phosphorus immersion, phosphorus brushing and phosphorus spraying. The spray phosphating process suitable for automatic production is more and more widely used. Phosphating coating is an important pre-treatment process, the purpose of which is to improve the passivity of the base material and the adhesion and corrosion resistance of the coating, but most of them are only suitable for low-carbon steel or low-strength alloy steel, and spray phosphorus Chemical fluids all contain "a class of environmental protection restricted element nickel". Due to some particularities of weapons and equipment, alloy steel and aluminum alloy are required to be combined ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/76C23C22/78C23C22/13C21D1/18C22F1/04
CPCC23C22/76C23C22/78C23C22/13C21D1/18C22F1/04
Inventor 庞留洋白新燕杨有才杨成
Owner HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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