阅读说明：本技术 一种减少磷化道子的磷化槽液配置方法 (Preparation method of phosphating tank liquor for reducing phosphating traces ) 是由 武大江 于 2020-11-27 设计创作，主要内容包括：本发明属于轿车涂装工艺技术领域,具体涉及一种减少磷化道子的磷化槽液配置方法；配制槽液前,先将循环泵放入槽内；向槽内加入经过稀释后的碱性中和剂,并震荡10-15分钟；向槽内加入磷化槽液,然后启动步骤一放入槽内的循环泵,通过循环泵让槽内的混合液在槽内循环96小时,使得混合有碱性中和剂的磷化槽液浓度均匀；解决了磷化槽液在更新初期质量不稳定从而导致磷化道子的问题。(The invention belongs to the technical field of car coating processes, and particularly relates to a preparation method of a phosphating tank solution for reducing phosphating tracks; before preparing the tank liquor, firstly putting a circulating pump into the tank; adding the diluted alkaline neutralizing agent into the tank, and shaking for 10-15 minutes; adding phosphating tank liquid into the tank, starting a circulating pump placed in the tank in the first step, and circulating the mixed liquid in the tank for 96 hours in the tank through the circulating pump to ensure that the concentration of the phosphating tank liquid mixed with the alkaline neutralizing agent is uniform; the problem of phosphating the channel caused by unstable quality of phosphating tank liquor at the initial updating stage is solved.)

1. A preparation method of phosphating tank liquor for reducing phosphating traces is characterized by comprising the following steps:

firstly, before preparing tank liquor, putting a circulating pump into a tank;

adding the diluted alkaline neutralizing agent into the tank, and oscillating for 10-15 minutes;

and step three, adding phosphating tank liquid into the tank, starting a circulating pump placed in the tank in the step one, and circulating the mixed liquid in the tank for 96 hours in the tank through the circulating pump so that the concentration of the phosphating tank liquid mixed with the alkaline neutralizing agent is uniform.

2. The method of claim 1, wherein the diluted alkaline neutralizing agent added in step two is a diluted solution prepared by mixing 6.2kg of alkaline neutralizing agent and 10L of water, wherein the alkaline neutralizing agent is sodium hydroxide.

3. The method as claimed in claim 2, wherein the concentration of the phosphating bath mixed with the alkaline neutralizer is uniform when Pt of the phosphating bath in the step III reaches 20-24 and AC reaches 2-5.

4. The method as claimed in claim 3, wherein if Pt of the phosphating solution is less than 20-24 and AC is less than 2-5 units, the circulation pump in the tank is continuously started to circulate the mixed solution in the tank until Pt of the phosphating solution is 20-24 and AC is 2-5.

Technical Field

The invention belongs to the technical field of car coating processes, and particularly relates to a preparation method of a phosphating tank solution for reducing phosphating tracks.

Background

The automobile coating pretreatment process is the first process in the automobile coating process, and aims to attach a layer of phosphating film (zinc iron phosphate/zinc phosphate crystals) on the surface of an automobile body steel plate so as to increase the adhesion and corrosion resistance of an electrophoretic paint film. The main procedures are as follows: hot water washing → degreasing and deoiling (degreasing) → water washing → surface conditioning (surface conditioning) → phosphating → water washing → passivation → pure water washing.

If the generated phosphating film is not uniform and has channel defects, the surface conductivity is inconsistent, so that the thickness of the electrophoresis layer of each part is influenced in the electrophoresis process, and stepped lines (the thickness of the film on two sides of the lines is inconsistent) are generated after electrophoresis, which are commonly called phosphating channels. The phosphatized ballast is not treated, and the upper paint film cannot be shielded, so that the final paint film quality and the user perception are influenced. But the treatment of the phosphorized road can cause the problems of thinning of paint film, increase of dust particles, increase of labor cost and material cost, and the like.

Disclosure of Invention

In order to overcome the problems, the invention provides a preparation method of a phosphating tank solution for reducing phosphating tracks, which aims at solving the problem that phosphating tracks are generated on the surface of a vehicle body in a ternary zinc phosphating pretreatment process and the problem that the quality of the phosphating tank solution is unstable at the initial updating stage so as to cause phosphating tracks.

A preparation method of phosphating tank liquor for reducing phosphating traces comprises the following steps:

firstly, before preparing tank liquor, putting a circulating pump into a tank;

adding the diluted alkaline neutralizing agent into the tank, and oscillating for 10-15 minutes;

and step three, adding phosphating tank liquid into the tank, starting a circulating pump placed in the tank in the step one, and circulating the mixed liquid in the tank for 96 hours in the tank through the circulating pump so that the concentration of the phosphating tank liquid mixed with the alkaline neutralizing agent is uniform.

The diluted alkaline neutralizing agent added in the step two is a diluted solution obtained by uniformly mixing 6.2kg of alkaline neutralizing agent and 10L of water, wherein the alkaline neutralizing agent is sodium hydroxide.

When the Pt of the phosphating tank solution in the step III reaches 20-24 and the AC reaches 2-5, the concentration of the phosphating tank solution mixed with the alkaline neutralizing agent is uniform.

If the Pt of the phosphating tank solution is not 20-24 and the AC is not 2-5 units, continuously starting a circulating pump in the tank to circulate the mixed solution in the tank until the Pt of the tank solution is 20-24 and the AC is 2-5.

The invention has the beneficial effects that:

the preparation process and the preparation method of the phosphating tank liquid are optimized, the concentration of the neutralizing agent is diluted, the phosphating channel generated by overhigh concentration of local free acid caused by overhigh concentration of the neutralizing agent is prevented, the effect of effective components of the phosphating tank liquid is improved under the condition of not increasing space and equipment modification investment, and the problem of the phosphating channel of a vehicle body is effectively avoided.

Detailed Description

The principle of the invention is that the reason for generating the phosphorization channel is that at the initial stage of using the novel phosphorization tank liquor, the neutralizer in the tank liquor is not uniformly dispersed, so that crystal nuclei attached to the surface of the steel plate are not uniform, and the phosphorization channel defect is generated.

A preparation method of phosphating tank liquor for reducing phosphating traces comprises the following steps:

firstly, before preparing tank liquor, putting a circulating pump into a tank;

adding the diluted alkaline neutralizing agent into the tank, and oscillating for 10-15 minutes;

and step three, adding phosphating tank liquid (prepared by 0.6Pt of free acid of Shenyang Paka company) into the tank, starting a circulating pump placed in the tank in the step one, and circulating the mixed liquid in the tank for 96 hours by the circulating pump so as to ensure that the concentration of the tank liquid mixed with the alkaline neutralizing agent is uniform.

The diluted alkaline neutralizing agent added in the step two is a diluted solution formed by uniformly mixing 6.2kg of alkaline neutralizing agent and 10L of water, wherein the alkaline neutralizing agent is sodium hydroxide.

When the activity index Pt of the bath solution in the third step reaches 20-24 and AC reaches 2-5, the concentration of the bath solution mixed with the alkaline neutralizing agent is uniform.

If the Pt of the bath solution is not within the unit of 20-24 and the AC is not within the unit of 2-5, continuously starting a circulating pump in the bath to circulate the mixed solution in the bath until the Pt of the bath solution is 20-24 and the AC is 2-5.

A method for solving the quality problem of phosphorized channel generated by newly-prepared phosphorized tank liquor is characterized by that before the tank liquor is prepared, when the neutralizing agent stock solution is added, it is vibrated for 10-15 min. Each 62kg of neutralizer was diluted with 10L of water and added to the tank. When the tank is prepared, 100% deionized water is used for preparing the tank. The new bath solution is prepared according to the lowest concentration of the process range. And circulating for 96 hours after the preparation of the bath solution is finished, and then starting production. The process flow is used for eliminating the channel problem generated when the novel phosphating tank liquid is used. Through the optimization of the feeding process and the tank preparation liquid, the dispersibility of the effective components in the phosphating solution is improved and the activity of the effective components is partially reduced.

The invention discloses a method for treating phosphorization channel defects caused by newly-prepared phosphorization liquid when a pretreatment process of ternary zinc series phosphorization is used. The method increases the dispersibility of the phosphating active ingredients and reduces the activity of the phosphating active ingredients from the aspects of optimizing the feeding mode, adjusting the water quality of the preparation tank and the like, thereby solving the quality problem of the initial phosphating channel of the new preparation tank liquid. The method does not increase the investment of space and equipment and does not increase the manpower.

The scope of the present invention is not limited to the specific details of the above-described embodiments, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention, and these simple modifications belong to the scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.