CN111690966A

CN111690966A - Preparation method of super-hydrophobic B30 copper-nickel alloy

Info

Publication number: CN111690966A
Application number: CN201910179767.8A
Authority: CN
Inventors: 陈宇
Original assignee: Binzhou University
Current assignee: Binzhou University
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2020-09-22

Abstract

The invention belongs to the technical field of functional materials, and relates to a preparation method of a super-hydrophobic B30 copper-nickel alloy. The invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, and particularly relates to a super-hydrophobic structure prepared by an electrodeposition method. Has the following advantages: on one hand, etching is carried out on the copper-nickel alloy in an acid medium; on the other hand, stable polymer film is formed by benzotriazole and monovalent copper to construct a super-hydrophobic surface, so that the super-hydrophobic B30 copper-nickel alloy has excellent corrosion resistance. The preparation process is simple, the reproducibility is good, expensive equipment and complex chemical treatment process are not needed, and the method has wide industrial application prospect.

Description

Preparation method of super-hydrophobic B30 copper-nickel alloy

Technical Field

The invention belongs to the technical field of functional materials, and particularly relates to a preparation method of a super-hydrophobic B30 copper-nickel alloy.

Background

With the increasingly wide application of the copper-nickel alloy B30 in national economy, particularly as an important component of a generator set, namely a condenser, in China and other countries, most of pipes of the copper-nickel alloy B30 are made of copper-nickel alloy, however, the copper-nickel alloy pipe of the condenser is corroded due to the influence of various factors, and the problem that whether a power plant can run safely and economically is solved.

In recent years, inspired by the "lotus effect", a superhydrophobic surface with a contact angle with a water drop of more than 150 ° has difficulty in permeating water molecules and corrosive ions into the inside of the superhydrophobic surface due to the strong hydrophobic characteristic of the superhydrophobic surface. Therefore, the super-hydrophobic corrosion inhibition film is constructed on the metal substrate, and the corrosion resistance of the super-hydrophobic corrosion inhibition film can be obviously improved.

At present, stearic acid is commonly used for constructing a super-hydrophobic structure on a metal surface, but the super-hydrophobic structure has short service life and is easy to damage after being soaked in a corrosive medium for a long time. The preparation method of the super-hydrophobic surface reported at present either needs harsh equipment or has too long preparation time. Therefore, the preparation method for developing the simple, efficient and long-life super-hydrophobic B30 copper-nickel alloy has important economic and social significance.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a quick and long-life super-hydrophobic B30 copper-nickel alloy preparation method, the super-hydrophobic structure constructed by the method is stable, and the method is particularly suitable for protecting the B30 copper-nickel alloy in seawater corrosion medium.

The invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, which comprises the following steps:

(1) b30 copper-nickel alloy pretreatment:

b30 copper-nickel alloy is polished by abrasive paper of different types, and then cleaned by absolute ethyl alcohol and acetone for 10 minutes to remove impurities, oxides and organic matters on the surface, and finally processed by N₂Drying for later use;

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, benzotriazole and absolute ethyl alcohol, and the mass fractions are respectively as follows: linolenic acid 20-35 wt%, benzotriazole 10-20 wt%, and anhydrous alcohol 55-70 wt%, with the total content of 100 wt%. The preparation method of the super-hydrophobic B30 copper-nickel alloy provided by the invention has the advantages that the constant potential is 2-5V, the electrodeposition time is 8-20 h, and the temperature is 30-50 ℃. On one hand, the invention utilizes the etching of the copper-nickel alloy in an acid medium; on the other hand, stable polymer film is formed by benzotriazole and monovalent copper to construct a super-hydrophobic surface, so that the super-hydrophobic B30 copper-nickel alloy has excellent corrosion resistance. The preparation process is simple, the reproducibility is good, expensive equipment and complex chemical treatment process are not needed, and the method has wide industrial application prospect.

The invention has the beneficial effects that:

1. the invention provides a preparation method of super-hydrophobic B30 copper-nickel alloy, which can obviously improve the corrosion resistance of the alloy in seawater corrosive medium;

2. the invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, wherein linolenic acid is adopted as an electrolyte, and the obtained film layer has better super-hydrophobic property;

3. the invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, which has lower applied voltage and can effectively reduce energy consumption;

4. the invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, wherein the electro-deposition time is short, and a super-hydrophobic surface can be constructed in only 12 hours under the voltage of 2V;

5. the invention provides a preparation method of super-hydrophobic B30 copper-nickel alloy, the service life of a super-hydrophobic film is longer;

6. the invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, which not only has a super-hydrophobic structure, but also forms a polymerization film of benzotriazole and monovalent copper on the surface;

7. the invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, which has excellent protection effect on the B30 copper-nickel alloy in a simulated seawater corrosion medium (a detection result of sea water in east China: distilled water + 2.5% NaCl + 0.2% CaCl2+ 0.6% MgCl2.6H20+ 0.5% Na2SO4+ 0.15% NaHC03+ 0.08% KCl);

8. the invention provides a preparation method of a super-hydrophobic B30 copper-nickel alloy, wherein the preparation method is simple, the energy consumption is low, the electrolyte formula is non-toxic and pollution-free, and the preparation method can be applied to large-scale industrial application.

Drawings

FIG. 1: contact angle of untreated B30 cupronickel;

FIG. 2: contact angle of super hydrophobic B30 copper nickel alloy;

FIG. 3: the electrochemical impedance test result of the untreated B30 copper-nickel alloy in simulated seawater is obtained;

FIG. 4: the electrochemical impedance test result of the super-hydrophobic B30 copper-nickel alloy in simulated seawater is obtained;

FIG. 5: the polarization curve test result of the untreated B30 copper-nickel alloy in simulated seawater is shown;

FIG. 6: the curve test result of the super-hydrophobic B30 copper-nickel alloy in simulated seawater is shown.

Detailed Description

The invention is further described below with reference to the figures and examples. While the invention will be described in conjunction with the preferred embodiments, it will be understood that they are not intended to limit the invention to the embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the scope of the invention as defined by the appended claims.

Example 1:

(1) b30 copper-nickel alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, benzotriazole and absolute ethyl alcohol, and the mass fractions are respectively as follows: linolenic acid 20%, benzotriazole 10% and absolute ethyl alcohol 70%. The preparation method of the super-hydrophobic B30 copper-nickel alloy provided by the invention has the advantages that the constant potential is 2V, the electrodeposition time is 20 h, and the temperature is 30 ℃.

The contact angle of the prepared super-hydrophobic B30 copper-nickel alloy is measured by a contact angle tester, and compared with that of B30 copper-nickel alloy which is not subjected to super-hydrophobic treatment, the result is shown in figures 1 and 2, and after the copper-nickel alloy is treated by the method, the contact angle of the B30 copper-nickel alloy is higher than 150 degrees.

Example 2:

(1) b30 copper-nickel alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, benzotriazole and absolute ethyl alcohol, and the mass fractions are respectively as follows: linolenic acid 355%, benzotriazole 10% and absolute ethyl alcohol 55%. The preparation method of the super-hydrophobic B30 copper-nickel alloy provided by the invention has the advantages that the constant potential is 5V, the electrodeposition time is 8 h, and the temperature is 50 ℃.

The super-hydrophobic B30 copper-nickel alloy is added into a simulated seawater medium (the detection result of the east sea seawater is distilled water + 2.5% NaCl + 0.2% CaCl)₂+0.6 % MgCl₂.6H₂0+0.5 % Na₂SO₄+0.15 % NaHC0₃+ 0.08% KCl), as compared with B30 copper-nickel alloy without superhydrophobic treatment, the results are shown in fig. 3 and fig. 4 and table 1, after treatment by this method, the film resistance and charge transfer resistance are significantly increased, which indicates that the prepared superhydrophobic B30 copper-nickel alloy has better corrosion resistance.

TABLE 1

Example 3:

(1) b30 copper-nickel alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, benzotriazole and absolute ethyl alcohol, and the mass fractions are respectively as follows: 30% of linolenic acid, 10% of benzotriazole and 60% of absolute ethyl alcohol. The preparation method of the super-hydrophobic B30 copper-nickel alloy provided by the invention has the advantages that the constant potential is 3V, the electrodeposition time is 10 h, and the temperature is 40 ℃.

The super-hydrophobic B30 copper-nickel alloy is added into a simulated seawater medium (the detection result of the east sea seawater is distilled water + 2.5% NaCl + 0.2% CaCl)₂+0.6 % MgCl₂.6H₂0+0.5 % Na₂SO₄+0.15 % NaHC0₃+ 0.08% KCl), as compared with B30 copper-nickel alloy without superhydrophobic treatment, the results are shown in FIG. 5 and FIG. 6 and Table 2, and the self-corrosion current is obviously reduced after the treatment by the methodAnd small, the prepared super-hydrophobic B30 copper-nickel alloy has better corrosion resistance.

TABLE 2

Condition	j, μA/cm²
		Without super-hydrophobic treatment	2.65
Super-hydrophobic	0.102

Claims

1. A preparation method of a super-hydrophobic B30 copper-nickel alloy is characterized by comprising the following steps:

(1) b30 copper-nickel alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, benzotriazole and absolute ethyl alcohol, and the mass fractions are respectively as follows: linolenic acid 20-35 wt%, benzotriazole 10-20 wt%, and anhydrous alcohol 55-70 wt%, with the total content of 100 wt%.

2. The preparation method of the super-hydrophobic B30 copper-nickel alloy provided by the invention has the advantages that the constant potential is 2-5V, the electro-deposition time is 8-20 h, and the temperature is 30-50 ℃, so that the super-hydrophobic B30 copper-nickel alloy can be obtained, and the super-hydrophobic B30 copper-nickel alloy has excellent corrosion resistance in simulated seawater.

3. The method for preparing the super-hydrophobic B30 copper-nickel alloy as claimed in claim 1, wherein the method comprises the following steps: the electrolyte formula consists of linolenic acid, benzotriazole and absolute ethyl alcohol.

4. The method for preparing the super-hydrophobic B30 copper-nickel alloy as claimed in claim 1, wherein the method comprises the following steps: the B30 copper-nickel alloy is cleaned by ultrasonic wave and then is cleaned by N₂And (5) drying.

5. The method for preparing the super-hydrophobic B30 copper-nickel alloy as claimed in claim 1, wherein the method comprises the following steps: the simulated seawater is distilled water, 2.5 percent of NaCl, 0.2 percent of CaCl2, 0.6 percent of MgCl2.6H20, 0.5 percent of Na2SO4, 0.15 percent of NaHC03 and 0.08 percent of KCl.

6. The method for preparing the super-hydrophobic B30 copper-nickel alloy as claimed in claim 1, wherein the method comprises the following steps: the constant potential is 2-5V.

7. The method for preparing the super-hydrophobic B30 copper-nickel alloy as claimed in claim 1, wherein the method comprises the following steps: the electrodeposition time is 8-20 h.

8. The method for preparing the super-hydrophobic B30 copper-nickel alloy as claimed in claim 1, wherein the method comprises the following steps: the electrodeposition temperature is 30-50 ℃.