阅读说明：本技术 一种锌锰系磷化液及其制备方法 (Zinc-manganese phosphating solution and preparation method thereof ) 是由 焦倩 邱景 高树峰 于 2020-04-23 设计创作，主要内容包括：本发明公开了一种锌锰系磷化液,其包括磷酸5-15份、氧化锌10-15份、十二烷醇2-7份、氯化钙1-1.5份、硫酸钙2-5份、硝酸锰4-6份、柠檬酸2-5份、过硼酸钠1-2份、聚乙烯醇3-4份、羟甲基纤维素钠1-3份和促进剂0.1-0.5份。同时公开了其制备方法,通过添加特定重量含量的聚乙烯醇对锌锰磷化液中的锰离子、钙离子、锌离子形成的复合镀层具有促进作用,其对钢铁编码处理后能得到具有较佳防腐效果的磷化膜,且磷化液稳定,存放时间长。(The invention discloses zinc-manganese phosphating solution which comprises 5-15 parts of phosphoric acid, 10-15 parts of zinc oxide, 2-7 parts of dodecanol, 1-1.5 parts of calcium chloride, 2-5 parts of calcium sulfate, 4-6 parts of manganese nitrate, 2-5 parts of citric acid, 1-2 parts of sodium perborate, 3-4 parts of polyvinyl alcohol, 1-3 parts of sodium hydroxymethyl cellulose and 0.1-0.5 part of an accelerator. The polyvinyl alcohol with specific weight content is added to promote the composite coating formed by manganese ions, calcium ions and zinc ions in the zinc-manganese phosphating solution, so that a phosphating film with a better corrosion prevention effect can be obtained after steel coding treatment, and the phosphating solution is stable and has long storage time.)

1. The zinc-manganese phosphating solution is characterized by comprising 5-15 parts of phosphoric acid, 10-15 parts of zinc oxide, 2-7 parts of dodecanol, 1-1.5 parts of calcium chloride, 2-5 parts of calcium sulfate, 4-6 parts of manganese nitrate, 2-5 parts of citric acid, 1-2 parts of sodium perborate, 3-4 parts of polyvinyl alcohol, 1-3 parts of sodium hydroxymethyl cellulose and 0.1-0.5 part of an accelerator.

2. The zinc-manganese phosphating solution according to claim 1, wherein the accelerator is calcium nitrate or sodium nitrate.

3. A preparation method of zinc-manganese phosphating solution is characterized by comprising the following steps:

(1) weighing 5-15 parts of phosphoric acid, 10-15 parts of zinc oxide, 2-7 parts of dodecanol, 1-1.5 parts of calcium chloride, 2-5 parts of calcium sulfate, 4-6 parts of manganese nitrate, 2-5 parts of citric acid, 1-2 parts of sodium perborate, 3-4 parts of polyvinyl alcohol, 1-3 parts of sodium hydroxymethyl cellulose and 0.1-0.5 part of accelerator in sequence for later use;

(2) pouring the weighed zinc oxide and water into a container for preparing the phosphating solution, and uniformly stirring;

(3) uniformly mixing the weighed manganese nitrate, the accelerator, the phosphoric acid, the citric acid and water;

(4) and (3) uniformly mixing the solutions obtained in the steps (2) and (3), and then sequentially adding dodecanol, calcium chloride, calcium sulfate, sodium perborate, polyvinyl alcohol, sodium carboxymethylcellulose and an accelerator to obtain the zinc-manganese phosphating solution.

The technical field is as follows:

the invention belongs to the technical field of metal surface treatment, and particularly relates to a zinc-manganese phosphating solution and a preparation method thereof.

Background art:

phosphorization is a process of forming a phosphate chemical conversion film through chemical and electrochemical reactions, and the conversion film is often used as a pretreatment technology for metal corrosion prevention. The purpose of the phosphorization is mainly as follows: the paint can protect the base metal, prevent the metal from being corroded to a certain degree, and is used for priming before painting, so that the adhesive force and the corrosion resistance of a paint film layer are improved. The zinc-manganese phosphating solution can be used for surface treatment of steel. After the steel is phosphorized in the zinc-manganese phosphorization liquid containing manganese and zinc, a uniform phosphorization film is formed on the surface of the steel, and the wear resistance of the steel can be improved. The Chinese patent with the application number of 2006100099493 discloses a zinc-manganese phosphating solution, which comprises the following components: although the zinc-manganese phosphating solution can improve the antifriction property of mechanical parts to a certain extent, the formed phosphating film has unobvious improvement on the corrosion resistance and can not be stored for a long time, thereby limiting the application of the phosphating solution in industrial production.

The invention content is as follows:

the invention aims to overcome the defects in the prior art and seek to design a zinc-manganese phosphating solution and a preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a zinc-manganese phosphating solution comprises 5-15 parts of phosphoric acid, 10-15 parts of zinc oxide, 2-7 parts of dodecanol, 1-1.5 parts of calcium chloride, 2-5 parts of calcium sulfate, 4-6 parts of manganese nitrate, 2-5 parts of citric acid, 1-2 parts of sodium perborate, 3-4 parts of polyvinyl alcohol, 1-3 parts of sodium hydroxymethyl cellulose and 0.1-0.5 part of an accelerator.

Further, the accelerator is calcium nitrate or sodium nitrate.

A preparation method of zinc-manganese phosphating solution specifically comprises the following steps:

(1) weighing 5-15 parts of phosphoric acid, 10-15 parts of zinc oxide, 2-7 parts of dodecanol, 1-1.5 parts of calcium chloride, 2-5 parts of calcium sulfate, 4-6 parts of manganese nitrate, 2-5 parts of citric acid, 1-2 parts of sodium perborate, 3-4 parts of polyvinyl alcohol, 1-3 parts of sodium hydroxymethyl cellulose and 0.1-0.5 part of accelerator in sequence for later use;

(2) pouring the weighed zinc oxide and water into a container for preparing the phosphating solution, and uniformly stirring;

(3) uniformly mixing the weighed manganese nitrate, the accelerator, the phosphoric acid, the citric acid and water;

(4) and (3) uniformly mixing the solutions obtained in the steps (2) and (3), and then sequentially adding dodecanol, calcium chloride, calcium sulfate, sodium perborate, polyvinyl alcohol, sodium carboxymethylcellulose and an accelerator to obtain the zinc-manganese phosphating solution.

Compared with the prior art, the invention has the following beneficial effects: the polyvinyl alcohol with specific weight content is added to promote a composite coating formed by manganese ions, calcium ions and zinc ions in the zinc-manganese phosphating solution, so that a phosphating film with a better corrosion prevention effect can be obtained after steel coding treatment, and the phosphating solution is stable and long in storage time.

The specific implementation mode is as follows:

the invention is further illustrated by the following specific examples.