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Water-washing-free chromium-free treatment process before aluminum profile coating

A treatment process and technology of aluminum profiles, applied in the direction of metal material coating process, etc., can solve the problems of waste water discharge, cure the symptoms but not the root cause, and have little consideration for optimization and improvement, so as to achieve zero discharge of waste water, good stability, and reduction of slots. The effect of number requirements

Active Publication Date: 2022-08-05
安徽光铧帝业化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the chrome-free treatment of aluminum profiles before coating disclosed on the market focuses on the optimization and improvement of chromium-free passivation agents, while the improvement of oil-removing pickling agents and their treatment processes before chromium-free passivation Few considerations for optimization improvements
In addition, most of the chromium-free passivation agents in the existing disclosed technology need to be washed with water after treatment.
In addition, there are also plans that focus on the wastewater discharge during the entire aluminum profile pre-painting process, but they are all temporary solutions, not the root cause, and will inevitably involve the washing process, resulting in a certain amount of wastewater discharge

Method used

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  • Water-washing-free chromium-free treatment process before aluminum profile coating
  • Water-washing-free chromium-free treatment process before aluminum profile coating

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A chrome-free treatment process for aluminum profiles without washing before painting, such as figure 1 shown, including the following steps:

[0030] Step 1. Adjust the feeding rack and fix the aluminum profile on the feeding rack.

[0031] Step 2: Remove the grease on the surface of the aluminum alloy for the first time, prepare a degreaser, and spray the surface of the aluminum profile with a degreaser prepared by diluting the degreaser; Oils include deionized water 30%, oxalic acid 1%, hydrofluoric acid 1%, hydroxyethylidene diphosphonic acid 1%, benzotriazole 0.1%, block polyether surfactant 0.5%, treatment time 0.5% min, the treatment temperature was 25 °C.

[0032] Step 3: Remove the grease on the surface of the aluminum alloy for the second time, continue to rinse the surface of the aluminum profile with a degreasing treatment solution, the treatment time is 0.5min, and the treatment temperature is 25°C.

[0033] Step 4: Draining, draining is draining in a na...

Embodiment 2

[0037] A chrome-free treatment process for aluminum profiles without washing before painting, comprising the following steps:

[0038] Step 1. Adjust the feeding rack and fix the aluminum profile on the feeding rack.

[0039] Step 2: Remove the grease on the surface of the aluminum alloy for the first time, prepare a degreaser, and spray the surface of the aluminum profile with a degreaser prepared by diluting the degreaser; Oils include 55% deionized water, 10% oxalic acid, 10% hydrofluoric acid, 5% hydroxyethylidene diphosphonic acid, 5% benzotriazole, 5% block polyether surfactant, and the treatment time is 5min , the processing temperature is 25 ℃.

[0040] Step 3: Remove the grease on the surface of the aluminum alloy for the second time, and continue to rinse the surface of the aluminum profile with a degreasing treatment solution for a treatment time of 5 minutes and a treatment temperature of 25°C.

[0041] Step 4: Draining, draining is draining in a natural state, a...

Embodiment 3

[0045] A chrome-free treatment process for aluminum profiles without washing before painting, comprising the following steps:

[0046] Step 1. Adjust the feeding frame and fix the aluminum profile on the feeding frame.

[0047] Step 2: Remove the grease on the surface of the aluminum alloy for the first time, prepare a degreaser, and spray the surface of the aluminum profile with a degreaser prepared by diluting the degreaser; Oils include 80% deionized water, 20% oxalic acid, 20% hydrofluoric acid, 10% hydroxyethylidene diphosphonic acid, 10% benzotriazole, 10% block polyether surfactant, and the treatment time is 10min , the processing temperature is 25 ℃.

[0048] Step 3: Remove the grease on the surface of the aluminum alloy for the second time, continue to rinse the surface of the aluminum profile with a degreasing treatment solution, the treatment time is 10min, and the treatment temperature is 25°C.

[0049] Step 4: Draining, draining is draining in a natural state, and...

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Abstract

The invention discloses a washing-free chromate-free treatment process before aluminum profile coating, and belongs to the technical field of metal surface treatment.The washing-free chromate-free treatment process comprises the procedures of first-time oil removal, second-time oil removal, draining, chromate-free passivation, drying and the like, and an oil removal agent comprises, by weight, 30%-80% of deionized water, 1%-20% of organic acid, 1%-20% of fluoride and 1%-10% of a complexing agent; the chromium-free passivator comprises the following components in percentage by weight: 30%-90% of deionized water, 1%-20% of organic acid, 1%-20% of zircon salt main agent, 1%-10% of fluoride, 1%-10% of complexing agent and 1%-10% of cross-linking agent; the degreasing agent and the chromate-free passivation agent are efficient, environmentally friendly, simple in treatment process, good in stability and capable of well meeting relevant coating performance requirements of the aluminum profile, a washing procedure is omitted in the whole coating pretreatment process, the requirement for the number of grooves in a pretreatment line body is greatly reduced, zero discharge of waste water is achieved, and good economical efficiency is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a chromium-free treatment process for aluminum profiles without washing before painting. Background technique [0002] Aluminum profile is a hot-extruded aluminum alloy material, and its mechanical properties and application fields are also different depending on the alloy composition. Aluminum profiles are widely used in the fields of building doors and windows, curtain walls, indoor and outdoor decoration and building structures. Before painting, aluminum profiles need a certain metal pretreatment to ensure excellent coating adhesion and corrosion resistance. At present, the aluminum profiles on the market generally have traditional hexavalent chromium treatment and new environmentally friendly chromium-free treatment before painting. The traditional hexavalent chromium treatment contains Cr6+ carcinogens, which has serious harm to the human body and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/36C23C22/46C23C22/47C23G1/06C23G1/12
CPCC23C22/34C23C22/47C23C22/46C23C22/361C23G1/125C23G1/061C23C2222/20
Inventor 苏云鹤季鑫胡发青杨雨霖
Owner 安徽光铧帝业化学有限公司
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