Zinc series phosphating solution for aluminum alloys

A zinc-based phosphating solution and aluminum alloy technology, applied in the field of phosphating solution, can solve the problems of large phosphating crystal size, poor paint film adhesion, poor salt spray resistance, etc. less effect

Active Publication Date: 2015-03-11
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The film formation of aluminum material in the traditional phosphating solution for iron and steel is very poor or basically not film-forming, because the aluminum ions produced by the dissolution of aluminum under the action of acid accumulate to a certain extent, which will "poison" the phosphating solution and seriously hinder The progress of phosphating, when phosphating aluminum-steel mixed materials in the same tank, will also curb the progress of steel phosphating
The phosphating of aluminum material coating adopts zinc phosphating process. The aluminum phosphating solution currently used has a loose film and a large film weight, which results in poor adhesion of the paint film after the phosphating film is matched with cathodic electrophoresis and salt resistance. Poor mist; phosphating crystals are larger in size, in the form of needles or blocks, without granular crystals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Preparation of Colloidal Titanium Salt Surface Conditioner on Aluminum Alloy Surface

[0019] Synthetic formulation of colloidal titanium salt surface conditioner on aluminum alloy surface: deionized water: 240-255 parts; disodium hydrogen phosphate: 80-85 parts; sodium tripolyphosphate: 50-53 parts; potassium fluorotitanate: 5 parts ~7 parts; sodium hydroxide: 2~3 parts; sodium hexametaphosphate: 150~165 parts; sodium orthogluconate: 10~12 parts.

[0020] According to the above formula, prepare the aluminum alloy surface colloidal titanium salt surface regulator according to the following steps:

[0021] 1) Heat deionized water to 60-70°C.

[0022] 2) Add disodium hydrogen phosphate, sodium tripolyphosphate and sodium hydroxide in sequence, stir continuously, and heat up to 95-100°C.

[0023] 3) Add potassium fluorotitanate and sodium gluconate (scaling inhibitor and dispersant), and keep stirring for 20-30 minutes.

[0024] 4) Add sodium hexametaphosphate...

Embodiment 2

[0028] Example 2 Phosphating pretreatment of aluminum alloy surface for aluminum base bearing pad

[0029] 1. Sample: Take 1 piece of aluminum-based bearing bush for the test internal combustion engine. The aluminum alloy material grade on the inner surface of the bearing bush is AlSn6Si4CuMnCr; the chemical composition range of the aluminum alloy material of this grade is: 5-7.5% Sn; 3.25-4.75% Si; 0.6-1.2% Cu; 0.15-0.25% Mn; 0.15-0.25% Cr; balance % Al.

[0030] 2. Phosphating pretreatment steps before spraying synthetic coating on the aluminum alloy surface of the inner surface of the bearing bush:

[0031] 1) Use gasoline and other organic solvents to scrub the oil stains on the entire surface of the test bearing bush and then dry it.

[0032] 2) Soak in the special metal degreasing powder aqueous solution for 3 minutes, wipe off the oil, and wash with running tap water.

[0033] 3) Immerse the test bearing bush in the special degreasing agent for aluminum parts to degre...

Embodiment 3

[0059] Example 3 Phosphating pretreatment of aluminum alloy surface for aluminum-based bearing pad

[0060] 1. Sample: Take 1 piece of test aluminum-based bearing bush, and the aluminum alloy material grade on the inner surface of the bearing bush is AlSn 20 Cu, the chemical composition range of this brand aluminum alloy material is: 17.5-22.5% Sn; 0.7-1.3% Cu; the balance % Al.

[0061] 2. Phosphating pretreatment steps before spraying synthetic coating on the aluminum alloy surface of the inner surface of the bearing bush:

[0062] 1) Use gasoline and other organic solvents to scrub the oil stains on the entire surface of the test bearing bush and then dry it.

[0063] 2) Soak in the special metal degreasing powder aqueous solution for 3 minutes, wipe off the oil, and wash with running tap water.

[0064] 3) Immerse the test bearing bush in the special degreasing agent for aluminum parts to degrease for 5 minutes, and clean it with running tap water.

[0065] 4) Immerse t...

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Abstract

The invention relates to a zinc series phosphating solution for aluminum alloys. The zinc series phosphating solution comprises the following components: Zn<2+> 15-18 g/l, PO4<3-> 15-20 g/l, Cu<2+> 0.001-0.003 g/l,Fe<2+> 1-2.5 g/l, F<-> l-2.5 g/l, Ni<2+> 0.5-1.5 g/l. The components are mixed with deionized water so as to prepare the zinc series phosphating solution. The phosphating solution provided by the invention doesn't employ chromium so as to avoid the problem of chromium poison to environment and people, works at a low temperature (35-45 DEG C) so as to save energy, produces few sediments during working, can form a uniform and compact phosphating film with favorable corrosion resistance and the effects such as antifriction and lubrication at a high speed, and increases the bonding strength of a synthetic coating and an aluminum alloy substrate. Besides, the components of the phosphating solution are simple, and the raw materials are easy to purchase.

Description

technical field [0001] The invention relates to a phosphating solution, in particular to a zinc-based phosphating solution suitable for phosphating pretreatment before spraying a synthetic coating on the surface of an aluminum alloy. Background technique [0002] Aluminum and aluminum alloys are widely used because of their unique properties, but their chemical properties are extremely active, unstable, and easy to be corroded, so they need to be well treated to improve their surface properties and corrosion resistance. Synthetic coatings have excellent anti-seizure, anti-cavitation and corrosion resistance, excellent surface properties, and are increasingly used on metal surfaces. In the fields of machinery and metal, it is especially necessary to firmly bond the synthetic coating with the aluminum alloy substrate. Otherwise, the synthetic coating will easily peel off and bubble during operation, causing early failure of the anti-friction layer, and in severe cases, parts w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36
CPCC23C22/362
Inventor 冀庆康刘萍陈才科辛琦马彬刘安伦
Owner CHONGQING YUEJIN MACHINERY
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