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Organic promotive phosphating liquor as well as preparation method and use thereof

A phosphating liquid, organic technology, applied in the direction of metal material coating process, etc., can solve the problems of environmental pollution, complex index control, unusable phosphating liquid, etc. Effect

Inactive Publication Date: 2009-06-17
DONGGUAN YINGMING CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, different metal substrates have different requirements for phosphating temperature. Usually, the same phosphating solution cannot be used in the range of low temperature and medium and high temperature, which limits the operation of phosphating process.
At present, the most widely used phosphating solution contains nickel salt and uses nitrite as an accelerator. The nitrite in the phosphating working solution is unstable in acidic solution and needs to be added to the specified concentration every time it is produced. , the index control is relatively complicated, a large amount of accelerator will be wasted, and the generated gas will also seriously pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of phosphating solution

[0019] i. Preparation of base solution

[0020] Add 0.9 grams of iron powder, 10 grams of water and 30 grams of phosphoric acid to the reaction kettle to dissolve, then add 200 grams of zinc oxide to the reaction kettle, add 120 grams of water and stir for 5 minutes to a paste, then slowly add 600 grams of phosphoric acid and 12 grams of Stir hydrofluoric acid for 20 minutes until the solution is transparent, slowly add 60 grams of manganese carbonate, stir for 10 minutes until the solution is transparent, then add 500 grams of water, when the solution temperature is cooled to 30 ℃, slowly add 25 grams of fluorosilicic acid and stir until the solution is transparent And filter; measure the total acidity of the base liquid is not less than 800 points, the free acidity is not less than 145 points, and the density is 1.5-1.6 g / cm 3 ;

[0021] ii. Preparation of accelerator

[0022] Add 0.4 grams of sodium fluoroborate, 6 grams o...

Embodiment 2

[0028] (1) Preparation of phosphating solution

[0029] With embodiment 1;

[0030] (2) Use of phosphating solution

[0031] The first step is the configuration of the working fluid. Fill 2 / 3 volume of water in a 1-liter phosphating tank, add 60 grams of base liquid components, then add 2.5 grams of soda ash (dissolved in water before use), stir to dissolve, and then add accelerators Component 30 grams, stir well and add water to a volume of 1 liter, test the total acidity of 32-36 points, free acidity of 1.6-2.0 points, and adjust the temperature to the range of 10-20 °C;

[0032] The second step is the phosphating of the workpiece. The workpiece is immersed in the phosphating working solution prepared in the above steps for 10 minutes through degreasing, rust removal, water cleaning, neutralization, and surface conditioning, and then air-dried after washing with water;

[0033] The third step is the same as in Example 1.

Embodiment 3

[0035] (1) Preparation of phosphating solution

[0036] i. Preparation of base solution

[0037]Add 1.2 grams of iron powder, 10 grams of water and 30 grams of phosphoric acid into the reactor to dissolve, then add 150 grams of zinc oxide into the reactor, add 130 grams of water and stir for 5 minutes until it becomes a paste, then slowly add 550 grams of phosphoric acid and 14 grams Stir hydrofluoric acid for 20 minutes until the solution becomes transparent, slowly add 50 grams of manganese carbonate, stir for 10 minutes until the solution becomes transparent, then add 400 grams of water, when the solution temperature is cooled to 30°C, slowly add 20 grams of fluosilicic acid and stir until the solution is transparent And filter; measure the total acidity of the base liquid not less than 800 points, the free acidity not less than 145 points, and the density of 1.5-1.6 g / cm 3 ;

[0038] ii. Preparation of Accelerator

[0039] Add 6 grams of sodium fluoroborate, 4 grams of ...

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Abstract

The invention provides an organic promoting phosphating solution, a preparation method thereof and the application thereof; wherein, the phosphating solution comprises basic solution and an accelerant which have the weight ratio of 1.5-2.5:1; the basic solution is the mixture of iron powders, phosphoric acid, zinc oxide, hydrofluoric acid, carbonate, fluosilicic acid and water; the accelerant is the mixture of sodium fluoborate, tartaric acid, sodium chlorate, caustic soda, trinitrobenzene sulfonic acid and water. The phosphating solution has wide phosphating process, can be used within the temperature of 5-65 DEG C, is suitable for the treatment before coating of automobiles, electric apparatuses, furniture and mechanical equipment, has simple production and use methods and meets the requirement of environmental protection.

Description

technical field [0001] The invention relates to a phosphating solution, a preparation method and an application, in particular to a nickel-free wide-temperature phosphating solution, a preparation method and an application thereof. Background technique [0002] Before painting, metal generally needs to be pretreated in a solution containing phosphate to form a chemical conversion film of metal phosphate. This process is called phosphating. The main purpose of phosphating before painting is to provide short-term inter-process protection for the base metal, to prevent the metal from being corroded to a certain extent, and to improve the adhesion and corrosion resistance of the paint film. With the enhancement of people's awareness of environmental protection and the increasing shortage of energy, the new coating pretreatment process is developing towards the direction of low temperature, low energy consumption, low pollution and low toxicity. Although the phosphating film for...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 方刚钟萍
Owner DONGGUAN YINGMING CHEM ENG
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