Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of aluminum alloy chromium-free alkaline passivation solution and aluminum alloy passivation method

A chromium-free passivation, aluminum alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of human body and environmental toxicity, and achieve the effects of good discoloration resistance, energy saving, and easy process operation

Active Publication Date: 2018-01-16
SOUTH CHINA UNIV OF TECH
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a chromium-free alkaline passivation solution for aluminum alloys, so as to solve the problem of poisoning the human body and the environment caused by the traditional hexavalent chromium passivation process of aluminum alloys

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of aluminum alloy chromium-free alkaline passivation solution and aluminum alloy passivation method
  • A kind of aluminum alloy chromium-free alkaline passivation solution and aluminum alloy passivation method
  • A kind of aluminum alloy chromium-free alkaline passivation solution and aluminum alloy passivation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The preparation of a kind of aluminum alloy chromium-free alkaline passivation solution:

[0034] 25.0g of Na 2 MoO 4 2H 2 0, the sodium citrate of 4.0g, the KF of 5.0g and the sodium dodecylbenzenesulfonate of 0.08g are added in distilled water successively (add another kind of raw material after every kind of raw material is added completely dissolved), dissolve and mix, obtain Chromium-free passivation solution; Na in the passivation solution 2 MoO 4 2H 2 The concentration of O is 25g / L, the concentration of sodium citrate is 4g / L, the concentration of KF is 5g / L, and the concentration of sodium dodecylbenzenesulfonate is 0.08g / L;

[0035] Using an acid-base regulator (1.0wt% NaOH solution or 2.0wt% citric acid solution) to adjust the pH of the chromium-free passivation solution, so that the pH=10.5, to obtain an alkaline aluminum alloy chromium-free passivation solution;

[0036] (2) a kind of aluminum alloy alkaline passivation method comprises the steps:...

Embodiment 2

[0042] (1) The preparation of a kind of aluminum alloy chromium-free alkaline passivation solution:

[0043] 20.0g of Na 2 MoO 4 2H 2 0, the sodium citrate of 3.5g, the KF of 2.5g, the NaF of 1.5g and the sodium lauryl sulfate of 0.03g are added in distilled water successively (add another kind of raw material after every kind of raw material is completely dissolved), dissolve and mix Evenly, obtain aluminum alloy chromium-free passivation solution; Na in described aluminum alloy chromium-free passivation solution 2 MoO 4 2H 2 The concentration of O is 20g / L, the concentration of sodium citrate is 3.5g / L, the concentration of KF is 2.5g / L, the concentration of NaF is 1.5g / L, and the concentration of sodium lauryl sulfate is 0.03g / L ;

[0044] Using an acid-base regulator (1.0wt% NaOH solution or 2.0wt% citric acid solution) to adjust the pH of the chromium-free passivation solution, so that pH=10, to obtain an alkaline aluminum alloy chromium-free passivation solution; ...

Embodiment 3

[0051] (1) The preparation of a kind of aluminum alloy chromium-free alkaline passivation solution:

[0052] 18.0g of Na 2 MoO 4 2H 2 O, the sodium citrate of 3.0g, the KF of 2.0g, the NaF of 2.0g and the OP-10 of 0.05g are added in distilled water successively (add another kind of raw material after each raw material is completely dissolved), dissolve and mix to obtain Aluminum alloy chromium-free passivation solution; Na in the aluminum alloy chromium-free passivation solution 2 MoO 4 2H 2 The concentration of O is 18g / L, the concentration of sodium citrate is 3.0g / L, the concentration of KF is 2.0g / L, the concentration of NaF is 2.0g / L, and the concentration of OP-10 is 0.05g / L;

[0053] Using an acid-base regulator (1.0wt% NaOH solution or 2.0wt% citric acid solution) to adjust the pH of the chromium-free passivation solution, so that the pH=9.5, to obtain an alkaline aluminum alloy chromium-free passivation solution;

[0054] (2) a kind of aluminum alloy alkaline pa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of surface treatment of metal materials, and discloses a chromium-free alkaline passivation solution for aluminum alloys and a passivation method for aluminum alloys. The chromium-free alkaline passivation solution is obtained by adjusting the pH of the chromium-free passivation solution to alkalinity by an acid-base regulator; the chromium-free passivation solution is composed of molybdate, sodium citrate, film-forming accelerator, surface Active agent and water composition. The passivation method is as follows: firstly put the aluminum alloy into the alkali washing solution, and treat it at room temperature; then put the aluminum alloy into the pickling solution, treat it at room temperature, and clean it; drying to obtain a passivated aluminum alloy. The passivation solution of the invention has simple composition, stable chemical properties of each component, safety and environmental protection, convenient storage and transportation, simple process operation, low cost and easy industrialization. The passivation film of the invention grows rapidly and has good discoloration resistance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal materials, and in particular relates to an aluminum alloy chromium-free alkaline passivation solution and an aluminum alloy passivation method. Background technique [0002] Aluminum alloy is widely used in aerospace, mechanical equipment, home appliances, construction and other fields because of its high specific strength, good thermal and electrical conductivity, beautiful color, non-magnetic, good plasticity, and no low-temperature brittleness. Its consumption is second only to steel, and it is the second most used metal material in the industrial field. However, the chemical properties of aluminum alloy are relatively active. In the atmospheric environment, an extremely thin oxide film (usually a few nanometers in thickness) is easily formed on the surface of the aluminum alloy, which has a certain protective effect on the substrate. However, the natural oxide film is too t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/66C23C22/73
Inventor 穆松林关巧鸥李文芳杜军
Owner SOUTH CHINA UNIV OF TECH