High-performance corrosion-resistant steel pipe and method for manufacturing the same

Abstract

The application discloses a high-performance anticorrosion steel pipe and a preparation method thereof. The high-performance anticorrosion steel pipe comprises a pipe body made of iron and an alloy nickel plating layer chemically plated on the surface layer of the pipe body. The plating nickel solution for chemically plating the alloy nickel plating layer on the pipe body comprises 20 g / L of nickel sulfate, 7-9 g / L of nickel acetate, 13-16 g / L of sodium hypophosphite and 4-6 g / L of sodium citrate. The plating nickel solution is adjusted to have a pH of 4-5 by using sodium acetate, and has the advantage of improving the anticorrosion effect.

Description

Technical Field

[0001] This invention relates to a high-performance corrosion-resistant steel pipe and its preparation method. Background Technology

[0002] Steel pipes are widely used as building materials in complex environments. Ordinary steel pipes have poor corrosion resistance, which not only causes material waste but also reduces the load-bearing capacity of the steel pipes, threatening their safety and stability, and causing huge economic losses and social harm. Therefore, anti-corrosion measures are necessary. Summary of the Invention

[0003] The primary objective of this invention is to provide a high-performance corrosion-resistant steel pipe that offers the advantage of improved corrosion resistance.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] A high-performance corrosion-resistant steel pipe includes a pipe body made of iron and an alloy nickel plating layer electrolessly plated on the surface of the pipe body; the nickel plating solution for electrolessly plating the alloy nickel plating layer onto the pipe body includes 20 g / L nickel sulfate, 7-9 g / L nickel acetate, 13-16 g / L sodium hypophosphite and 4-6 g / L sodium citrate, and the pH of the nickel plating solution is adjusted to 4-5 using sodium acetate.

[0006] Preferably, the nickel plating solution comprises 20 g / L nickel sulfate, 8 g / L nickel acetate, 15 g / L sodium hypophosphite, 5 g / L sodium citrate, and 1 g / L sodium borohydride, and the pH of the nickel plating solution is adjusted to 4-5 using sodium acetate.

[0007] Preferably, the high-performance corrosion-resistant steel pipe further includes a coating layer applied to the surface of the alloy nickel plating layer; the coating solution for applying the coating layer to the alloy nickel plating layer includes 10 wt% triethanolamine, 3-6 wt% sodium benzoate, 1-3 wt% polyacrylamide and 9-12 wt% ethanol.

[0008] Preferably, the high-performance corrosion-resistant steel pipe further includes a coating layer applied to the surface of the alloy nickel plating layer; the coating solution for applying the coating layer to the alloy nickel plating layer includes 10 wt% triethanolamine, 5 wt% sodium benzoate, 2 wt% polyacrylamide, 10 wt% ethanol, 5 wt% epoxy acrylate resin and 0.5 wt% nano titanium dioxide.

[0009] The second objective of this invention is to provide a method for preparing high-performance corrosion-resistant steel pipes.

[0010] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0011] A method for preparing a high-performance corrosion-resistant steel pipe includes the following steps:

[0012] (1) Take a pipe made of iron, remove oil and rust, put it into nickel plating solution, adjust the temperature to 90°C and use sodium acetate to adjust the pH to 4-5, react for 1-2 hours, take it out and dry it at 40°C.

[0013] (2) Prepare a coating solution using water as the base solvent, apply the coating solution to the surface of the nickel-plated alloy layer, and dry it at 40°C after coating.

[0014] Preferably, the degreasing and rust removal treatment in step (1) is as follows: first, chemically degrease the pipe body using a surfactant and then rinse with water; then rinse with 15wt% dilute hydrochloric acid for 5-10 seconds and rinse with water; then rinse with 15wt% dilute hydrochloric acid containing 2wt% hexadecylamine for 5-10 seconds and rinse with water.

[0015] The main technical effects of this invention are reflected in the following aspects:

[0016] By electroless nickel plating, a layer of nickel is deposited on the metal surface. Compared with pure iron, the alloy nickel plating layer has a more negative electrode potential, thus having higher electrochemical protection performance, good chemical stability, improved corrosion resistance and wear resistance, and increased gloss and aesthetics.

[0017] A coating layer is applied by coating method to adsorb onto the metal surface in an ionic or molecular state, thereby preventing or delaying the corrosion process. Detailed Implementation

[0018] Example 1: A high-performance corrosion-resistant steel pipe, comprising a pipe body made of iron, an alloy nickel plating layer electrolessly plated on the surface of the pipe body, and a coating layer applied to the surface of the alloy nickel plating layer. This steel pipe is prepared by the following method:

[0019] (1) Degreasing and rust removal: Take a pipe made of iron, first rinse it with 2wt% sodium dodecyl sulfonate aqueous solution for 60s, and rinse it with water twice; then rinse it with 15wt% dilute hydrochloric acid for 10s, and rinse it with water twice; then rinse it with 15wt% dilute hydrochloric acid containing 2wt% hexadecylamine for 10s, and rinse it with water twice, and dry it at 40℃.

[0020] (2) Nickel plating: Prepare nickel plating solution, adjust the temperature to 90℃ and use sodium acetate to adjust the pH to 4-5; put the degreased and derusted pipe into the nickel plating solution, react for 90 minutes, take it out and dry it at 40℃.

[0021] (3) Coating: A coating solution is prepared using water as the base solvent; the coating solution is coated on the surface of the nickel-plated alloy layer, and then dried at 40°C. The coating layer thickness is 5μm.

[0022] The nickel plating solution consists of 20 g / L nickel sulfate, 8 g / L nickel acetate, 15 g / L sodium hypophosphite, 5 g / L sodium citrate, and 1 g / L sodium borohydride.

[0023] The coating solution comprises 10 wt% triethanolamine, 5 wt% sodium benzoate, 2 wt% polyacrylamide, 10 wt% ethanol, 5 wt% epoxy acrylate resin, and 0.5 wt% nano titanium dioxide, with the balance being water.

[0024] Example 2: A high-performance corrosion-resistant steel pipe, which differs from Example 1 in that it does not have a coating layer.

[0025] Example 3: A high-performance corrosion-resistant steel pipe, which differs from Example 1 in that no coating layer is provided and the nickel plating solution includes 20 g / L nickel sulfate, 8 g / L nickel acetate, 15 g / L sodium hypophosphite, and 5 g / L sodium citrate.

[0026] Example 4: A high-performance anti-corrosion steel pipe, which differs from Example 1 in that the coating liquid includes 10 wt% triethanolamine, 5 wt% sodium benzoate, 2 wt% polyacrylamide, 10 wt% ethanol, and the balance is water.

[0027] Example 5: A high-performance anti-corrosion steel pipe, which differs from Example 1 in that the coating liquid includes 10 wt% triethanolamine, 10 wt% ethanol, and the remainder is water.

[0028] Corrosion rate test of buried pipelines

[0029] Soil resistivity estimation method was adopted. Factors such as soil salinity, water content, soil type, and pH value are related to soil resistivity. When the evaluation requirements are not high, soil resistivity is used as a single indicator to evaluate the pipeline corrosion rate. The test results are shown in Table 1.

[0030] Table 1 shows that the corrosion is stronger in soil with low resistivity. The corrosion rate of the steel pipe is slowed down after the alloy nickel plating layer and coating layer are applied. The corrosion resistance ratio in the test environment is: Example 1 > Example 4 > Example 2, Example 5 > Example 3.

[0031] Table 1

[0032]

[0033] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A high-performance corrosion-resistant steel pipe, characterized in that, It includes a pipe body made of iron, an alloy nickel plating layer on the surface of the pipe body by electroless nickel plating, and a coating layer on the surface of the alloy nickel plating layer; The nickel plating solution for electrolessly plating the alloy nickel layer onto the pipe body comprises 20 g / L nickel sulfate, 8 g / L nickel acetate, 15 g / L sodium hypophosphite, 5 g / L sodium citrate, and 1 g / L sodium borohydride. The pH of the nickel plating solution is adjusted to 4-5 using sodium acetate. The coating solution used to coat the nickel-plated alloy layer comprises 10 wt% triethanolamine, 5 wt% sodium benzoate, 2 wt% polyacrylamide, 10 wt% ethanol, 5 wt% epoxy acrylate resin, and 0.5 wt% nano titanium dioxide. The high-performance corrosion-resistant steel pipe is prepared by the following method: (1) Take a tube made of iron, remove oil and rust, put it into nickel plating solution, adjust the temperature to 90℃ and use sodium acetate to adjust the pH to 4~5, react for 1~2 hours, take it out and dry it at 40℃. (2) Prepare a coating solution using water as the base solvent, apply the coating solution to the surface of the nickel-plated alloy layer, and dry it at 40°C after coating. The degreasing and rust removal process in step (1) is as follows: First, use a surfactant to chemically degrease the pipe body and then rinse with water; then rinse with 15wt% dilute hydrochloric acid for 5-10 seconds and rinse with water; then rinse with 15wt% dilute hydrochloric acid containing 2wt% hexadecylamine for 5-10 seconds and rinse with water.

Images