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Coating liquid phosphatizing agent and preparation method thereof

A phosphating agent and liquid technology, applied in the field of metal surface treatment, can solve the problems of weak film forming strength and corrosion resistance of phosphating liquid, and achieve the effect of dense and complete overall coverage, fine film layer and uniform micropores

Active Publication Date: 2018-03-06
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film-forming strength and corrosion resistance of room temperature phosphating solution are generally weak

Method used

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  • Coating liquid phosphatizing agent and preparation method thereof
  • Coating liquid phosphatizing agent and preparation method thereof
  • Coating liquid phosphatizing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] It is necessary to configure 1000kg liquid phosphating solution, and the required components are shown in Table 1:

[0030] The specific content list (kg) of each component of table 1

[0031]

[0032] The specific configuration process is:

[0033] Get 80kg zinc oxide and add in the container, then add deionized water in the container and stir into a paste, get 58.8L laboratory commonly used 85% phosphoric acid (mass volume ratio is 85%), add a small amount of deionized water to dilute, and then divide Slowly add twice to the above-mentioned container containing zinc oxide. Bubbles are released during the reaction between phosphoric acid and zinc oxide. The phosphoric acid solution is added dropwise until no bubbles are generated for the first time, and the remaining phosphoric acid solution is dripped for the second time. After the addition was completed, a clear solution was obtained. Under stirring, another solution with a density of 1.42 g cm was added. -3 35....

Embodiment 2

[0037] 1000kg liquid phosphating solution needs to be configured, and the required components are shown in Table 2:

[0038] The specific content list (kg) of each component of table 2

[0039]

[0040] The specific configuration process is:

[0041] Get 150kg zinc oxide and add in the container, then add deionized water in the container and stir into a paste, get 117.6L laboratory commonly used 85% phosphoric acid (mass volume ratio is 85%), add a small amount of deionized water to dilute, and then divide Slowly add twice to the above-mentioned container containing zinc oxide. Bubbles are released during the reaction between phosphoric acid and zinc oxide. The phosphoric acid solution is added dropwise until no bubbles are generated for the first time, and the remaining phosphoric acid solution is dripped for the second time. After the addition was completed, a clear solution was obtained. Under stirring, another solution with a density of 1.42 g cm was added. -3 70.4L o...

Embodiment 3

[0043] 800kg liquid phosphating solution needs to be configured, and the required components are shown in Table 3:

[0044] The specific content list (kg) of each component of table 3

[0045]

[0046]The specific configuration process is:

[0047] Get 80kg zinc oxide and add in the container, then add deionized water in the container and stir into a paste, get 65.9L laboratory commonly used 85% phosphoric acid (mass volume ratio is 85%), add a small amount of deionized water to dilute, and then divide Slowly add twice to the above-mentioned container containing zinc oxide. Bubbles are released during the reaction between phosphoric acid and zinc oxide. The phosphoric acid solution is added dropwise until no bubbles are generated for the first time, and the remaining phosphoric acid solution is dripped for the second time. After the addition was completed, a clear solution was obtained. Under stirring, another solution with a density of 1.42 g cm was added. -3 45.0L of ni...

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Abstract

The invention discloses a coating liquid phosphatizing agent and a preparation method thereof, and belongs to the technical field of metal surface treatment. The coating liquid phosphatizing agent comprises the following components in percentage by mass: 5-15% of phosphoric acid, 5-15% of nitric acid, 8-15% of zinc oxide, 5-15% of an oxidation accelerant, 6-18% of composite additives and 39-71% ofdeionized water. The coating liquid phosphatizing agent disclosed by the invention is excellent in property, and the corrosion resistance after coating and the coating density of a coating can be effectively improved.

Description

technical field [0001] The invention relates to a pretreatment agent for electrophoretic coating, which belongs to the technical field of metal surface treatment, in particular to a liquid phosphating agent for coating and a preparation method thereof. Background technique [0002] As a surface chemical treatment method, phosphating refers to contacting the metal surface with an acid solution containing dihydrogen phosphate, and forming a stable and insoluble inorganic compound film on the surface of the metal part through a certain chemical or electrochemical process. the process of. Phosphating reaction is a typical local heterogeneous reaction, which is essentially an electrochemical reaction. When a metal is immersed in a solution containing phosphate, many micro-corrosion cells are formed on its surface, and slight corrosion occurs. At the solution-metal interface Where the acid concentration decreases, the metal phosphate chemical conversion film formed is called a ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/17C25D13/20
CPCC23C22/17C25D13/20
Inventor 马颖庞涛程鹏郎丰军黄先球彭浩宋建红何锐
Owner 武汉钢铁有限公司
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