CN112695314A

CN112695314A - Solution for enhancing corrosion resistance of metal parts and preparation method thereof

Info

Publication number: CN112695314A
Application number: CN202011448787.XA
Authority: CN
Inventors: 孙宣杰; 王小海; 杨志浩; 孙悦茗; 侯晓科; 谭冲维; 席媛媛; 黄即; 闫静
Original assignee: Inner Mongolia First Machinery Group Corp
Current assignee: Inner Mongolia First Machinery Group Corp
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-04-23

Abstract

The invention relates to a solution for enhancing the corrosion resistance of metal parts and a preparation method thereof, wherein a formula is formed by polyvinyl alcohol, polyethylene glycol 400, a silane coupling agent, potassium silicate, silica sol, a nonionic surfactant, oleic acid monoethanolamide, sodium tripolyphosphate, butanol and water according to a proper proportion. The protective layer is adjusted to proper viscosity and sprayed, brushed or dipped on the surface of the steel part needing heat treatment protection, and the protective layer with uniform thickness, compact coating and good combination is obtained on the steel part, so that the corrosion resistance of electrochemical or chemical treatment can be enhanced. The metal parts can achieve the long-term antirust effect, and do not generate the problems of organic solvent emission pollution and environmental management.

Description

Solution for enhancing corrosion resistance of metal parts and preparation method thereof

Technical Field

The invention belongs to the technical field of surface treatment, and particularly relates to a solution for enhancing the corrosion resistance of a metal part and a preparation method thereof, in particular to a solution for enhancing the corrosion resistance of the metal part after electrochemical or chemical treatment and a preparation method thereof.

Background

After the metal parts are subjected to electrochemical or chemical treatment, in order to increase the rust-proof performance of the parts, the post-treatment is generally performed by the following method: metal salt sealing, saponification treatment, oil immersion sealing and the like. The treated parts can have short-term antirust capacity, the antirust time is different according to different climatic conditions, and the corrosion is accelerated in a humid climatic environment. The antirust performance of parts is also improved by adopting a film coating mode, and the longer antirust period can be achieved by adopting varnish generally, so that the problems of organic solvent emission pollution and environmental management exist.

The corrosion resistance of the electroplated layer generated by electrochemical treatment without post-treatment is lower, the neutral salt spray resistance test of the galvanized layer is usually within 96h, and the neutral salt spray resistance test of the chromium plating and nickel plating is usually within 120 h. The metal salt is adopted to seal the electroplated layer, and the neutral salt spray resistance test is usually within 120 h; conversion films formed by electrochemical or chemical treatment, such as oxidation and phosphating film layers, are subjected to saponification and oil immersion sealing treatment, and a neutral salt spray resistance test is usually within 48 hours, so that the requirements of corrosion resistance in a severe environment cannot be met.

The defects of the varnish treatment are mainly the problems of organic solvent emission pollution and environmental management. The treatment by using the water-based antirust agent has the main defects of short or indefinite antirust period, and the antirust effect by using heavy metal ions or metal organic matters, and the environmental pollution.

Disclosure of Invention

The invention provides a solution for enhancing the corrosion resistance of metal parts and a preparation method thereof, and aims to solve the technical problems that: the defects of the corrosion resistance of the parts after electrochemical or chemical treatment are overcome.

In order to solve the technical problems, the invention provides a solution for enhancing the corrosion resistance of metal parts, which comprises the following components in percentage by weight:

2-10% of polyvinyl alcohol, 4000.1-0.5% of polyethylene glycol, 0.1-0.5% of silane coupling agent, 1-3% of potassium silicate, 1-5% of silica sol, 0.1-0.5% of nonionic surfactant, 0.1-0.5% of oleic acid monoethanolamide, 0.05-0.1% of sodium tripolyphosphate, 10-20% of butanol and the balance of water (the conductivity is less than 5.0 mu s/cm).

A process for preparing the anticorrosion solution used for the electrochemical or chemical treatment of metallic parts includes such steps as adding one-half of water (electric conductivity less than 5.0 microns/cm) to a container, adding polyvinyl alcohol, and heating for dissolving. Then polyethylene glycol 400, a silane coupling agent, potassium silicate, silica sol, a nonionic surfactant, oleic acid monoethanolamide, sodium tripolyphosphate and butanol are added in sequence. Supplementing the balance of water (the conductivity is less than 5.0 mu s/cm), and uniformly stirring at high speed.

When in use, a part to be treated is soaked in the solution to form a film layer with the thickness of 8-15 mu m, naturally dried for more than 2h at normal temperature, and dried for 10min at the temperature of 60-80 ℃.

The prepared solution is sprayed, brushed or dipped on the surface of the part needing heat treatment protection.

Has the advantages that: after the water-soluble resin is prepared, the antirust agent and the corrosion inhibitor are blended, a protective layer with uniform thickness, compact coating and good combination can be obtained on the surface of the steel part needing heat treatment protection, and the protective layer can be used for enhancing the corrosion resistance of electrochemical or chemical treatment; the metal parts can achieve the long-term antirust effect, and do not generate the problems of organic solvent emission pollution and environmental management.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.

Example 1

2 percent of polyvinyl alcohol, 4000.1 percent of polyethylene glycol, 0.1 percent of silane coupling agent, 1 percent of potassium silicate, 1 percent of silica sol, 0.1 percent of nonionic surfactant, 0.1 percent of oleic acid monoethanolamide, 0.05 percent of sodium tripolyphosphate, 10 percent of butanol, and the balance of water (the conductivity is less than 5.0 mu s/cm). The solution is adopted to soak the oxidized and phosphatized parts, and after the parts are dried, the neutral salt spray resistance test can reach 168 h.

Example 2

10 percent of polyvinyl alcohol, 4000.5 percent of polyethylene glycol, 0.5 percent of silane coupling agent, 3 percent of potassium silicate, 5 percent of silica sol, 0.5 percent of nonionic surfactant, 0.5 percent of oleic acid monoethanolamide, 0.1 percent of sodium tripolyphosphate, 20 percent of butanol, and the balance of water (the conductivity is less than 5.0 mu s/cm). The solution is adopted to soak parts subjected to oxidation, phosphorization and galvanization, and after the parts are dried, a neutral salt spray resistance test can reach 240 hours.

Example 3

6 percent of polyvinyl alcohol, 4000.4 percent of polyethylene glycol, 0.3 percent of silane coupling agent, 2 percent of potassium silicate, 3 percent of silica sol, 0.3 percent of nonionic surfactant, 0.4 percent of oleic acid monoethanolamide, 0.2 percent of sodium tripolyphosphate, 15 percent of butanol, and the balance of water (the conductivity is less than 5.0 mu s/cm). The solution is adopted to soak parts subjected to oxidation, phosphorization and galvanization, and after the parts are dried, a neutral salt spray resistance test can reach 180 hours.

The invention designs a formula for enhancing the corrosion resistance by electrochemical or chemical treatment, prepares a closed and antirust film layer, forms a protective film layer on the surface of a part subjected to electrochemical or chemical treatment, and solves the problem of insufficient corrosion resistance of the part subjected to electrochemical or chemical treatment such as galvanizing, phosphating and oxidation.

The invention is applied to the test for improving the corrosion resistance of phosphating and oxidation parts, and can ensure that the center salt spray resistance test of the treated parts reaches more than 168 hours.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A solution for enhancing the corrosion resistance of metal parts, characterized by: the weight percentage components are as follows:

polyvinyl alcohol: 2-10% of polyethylene glycol 400: 0.1-0.5%, silane coupling agent: 0.1 to 0.5%, potassium silicate: 1-3% of silica sol: 1-5% of a nonionic surfactant: 0.1-0.5%, oleic acid monoethanolamide: 0.1-0.5%, sodium tripolyphosphate: 0.05-0.1%, butanol: 10-20% and the balance of water.

2. The solution for enhancing the corrosion resistance of metal parts according to claim 1, wherein: the conductivity of the water is less than 5.0 mu s/cm.

3. The solution for enhancing the corrosion resistance of metal parts according to claim 1, wherein: the solution is used after electrochemical or chemical treatment of the metal parts.

4. A method for preparing a solution for enhancing corrosion resistance, comprising the steps of:

firstly, adding half of metered water into a container, and then adding polyvinyl alcohol for heating and dissolving; then sequentially adding polyethylene glycol 400, a silane coupling agent, potassium silicate, silica sol, a nonionic surfactant, oleic acid monoethanolamide, sodium tripolyphosphate and butanol; supplementing the rest of water, and stirring at high speed.

5. The preparation method of the solution for enhancing corrosion resistance according to claim 4, wherein the part to be treated is soaked in the solution to form a film layer with a thickness of 8-15 μm, and the film layer is naturally dried for more than 2h at normal temperature and dried for 10min at 60-80 ℃.

6. The method of claim 4, wherein the solution is sprayed, brushed or dipped onto the surface of the part to be protected by heat treatment.