阅读说明：本技术 一种耐高温锌合金牺牲阳极及其制备方法 (High-temperature-resistant zinc alloy sacrificial anode and preparation method thereof ) 是由 逯彦伟 逯颜军 江玉仁 唐彪 宋婕 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种耐高温锌合金牺牲阳极,由锌、铝、铟、镁、镍、锆和硅组成；所述铝的质量百分比为0.5～1.2％；所述铟的质量百分比为0.20～0.25％；所述镁的质量百分比为0.5～1.2％；所述镍的质量百分比为0.05～0.2％；所述锆的质量百分比为0.05～0.08％；所述硅的质量百分比为0.80～1.20％；余量为锌。该耐高温锌合金牺牲阳极在传统的锌合金的基础上加入了锆元素,可以显著提升锌合金在高温下的电化学性能和耐腐蚀性能；本发明的锌合金牺牲阳极,在75℃～80℃的高温条件下,电流效率高于92％,开路电位为-1.02～-1.05V,电容量≥1000A·h/kg。(The invention discloses a high-temperature-resistant zinc alloy sacrificial anode, which consists of zinc, aluminum, indium, magnesium, nickel, zirconium and silicon; the mass percent of the aluminum is 0.5-1.2%; the mass percentage of the indium is 0.20-0.25%; the mass percent of the magnesium is 0.5-1.2%; the mass percent of the nickel is 0.05-0.2%; the mass percent of the zirconium is 0.05-0.08%; the mass percent of the silicon is 0.80-1.20%; the balance being zinc. The high-temperature-resistant zinc alloy sacrificial anode is added with zirconium element on the basis of the traditional zinc alloy, so that the electrochemical performance and the corrosion resistance of the zinc alloy at high temperature can be obviously improved; the zinc alloy sacrificial anode has the current efficiency higher than 92 percent, the open circuit potential of-1.02 to-1.05V and the capacitance more than or equal to 1000 A.h/kg under the high temperature condition of 75 to 80 ℃.)

1. A high-temperature resistant zinc alloy sacrificial anode is characterized by comprising zinc, aluminum, indium, magnesium, nickel, zirconium and silicon; the mass percent of the aluminum is 0.5-1.2%; the mass percentage of the indium is 0.20-0.25%; the mass percent of the magnesium is 0.5-1.2%; the mass percent of the nickel is 0.05-0.2%; the mass percent of the zirconium is 0.05-0.08%; the mass percent of the silicon is 0.80-1.20%; the balance being zinc.

2. The sacrificial anode of claim 1, wherein the impurity iron is less than or equal to 0.09%, the impurity copper is less than or equal to 0.03%, and the impurity cadmium is less than or equal to 0.02%.

3. The preparation method of the high-temperature-resistant zinc alloy sacrificial anode is characterized by comprising the following steps of:

(1) smelting a zinc ingot to obtain zinc liquid, covering a graphite layer above the zinc liquid, and continuously introducing inert gas for protection in the smelting process;

(2) after the zinc liquid is kept warm for 30-35 min, adding indium, nickel and zirconium wrapped by aluminum foil into the zinc liquid until the indium, the nickel and the zirconium are completely melted, and then adding zinc-magnesium alloy and aluminum-silicon alloy; stirring uniformly, slagging off, and keeping the temperature for 3-3.5 hours to obtain a mixed solution;

(3) and (3) casting and molding the mixed solution in a mold at 580-620 ℃, and cooling to room temperature.

4. The method for preparing the high-temperature-resistant zinc alloy sacrificial anode according to claim 3, wherein in the step (1), the heating temperature of the zinc ingot is 530-580 ℃, and the added inert gas is nitrogen.

5. The method for preparing the sacrificial anode of the high-temperature-resistant zinc alloy as claimed in claim 3, wherein in the step (2), the indium, the nickel and the zirconium need to be dried at 100-120 ℃ before being added, so as to remove moisture.

6. The method for preparing the high-temperature-resistant zinc alloy sacrificial anode according to claim 3, wherein in the step (2), the content of magnesium in the zinc-magnesium alloy is 40-70%.

7. The method for preparing the high-temperature-resistant zinc alloy sacrificial anode according to claim 3, wherein in the step (2), the content of silicon element in the aluminum-silicon alloy is 8-20%.

8. The method for preparing the high-temperature-resistant zinc alloy sacrificial anode as claimed in claim 3, wherein the zinc alloy sacrificial anode has a current efficiency of more than 92%, an open circuit potential of-1.02 to-1.05V and a capacitance of more than or equal to 1000 A.h/kg at a high temperature of 75-80 ℃.

Technical Field

The invention relates to the technical field of sacrificial anodes, in particular to a high-temperature-resistant zinc alloy sacrificial anode and a preparation method thereof.

Background

The zinc-based sacrificial anode has small self-corrosion rate and high current efficiency, the potential of the zinc-based sacrificial anode is close to the protection potential of steel, the zinc-based sacrificial anode has the characteristic of automatically adjusting the current, and the zinc-based sacrificial anode has no over-protection danger in use. The driving voltage of the zinc-based anode is only about 0.2V, and the zinc-based anode is mainly suitable for seawater, salt water and a low-resistivity (<15 omega cm) soil environment. At present, zinc alloy sacrificial anodes are widely applied to cathodic protection engineering of marine structures and submarine pipeline engineering. Meanwhile, the zinc alloy sacrificial anode does not generate hydrogen evolution reaction in use and does not induce sparks when colliding with steel components, so that the zinc alloy sacrificial anode is the only sacrificial anode capable of being used for protecting oil tanks and oil cabins.

The Chinese invention patent CN104864710A discloses an environment-friendly zinc alloy sacrificial anode, the working potential is-1.00 to-1.06V, the corrosion product is easy to fall off, and the corrosion appearance is uniformly dissolved; the capacitance is more than or equal to 800 A.h/Kg. The zinc alloy sacrificial anode provided by the patent has the advantages of wide application range, small environmental pollution, simple preparation method and low cost; has obvious economic benefit and environmental benefit. However, the temperature of the oil tank and the oil tank is very high due to the sun exposure and the like, and the temperature of the oil tank can even reach more than 70 ℃, so that a high-temperature resistant zinc alloy sacrificial anode and a preparation method thereof need to be researched.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a high-temperature-resistant zinc alloy sacrificial anode and a preparation method thereof.

The technical scheme of the invention is as follows:

a high temperature resistant zinc alloy sacrificial anode consists of zinc, aluminum, indium, magnesium, nickel, zirconium and silicon; the mass percent of the aluminum is 0.5-1.2%; the mass percentage of the indium is 0.20-0.25%; the mass percent of the magnesium is 0.5-1.2%; the mass percent of the nickel is 0.05-0.2%; the mass percent of the zirconium is 0.05-0.08%; the mass percent of the silicon is 0.80-1.20%; the balance being zinc.

Preferably, the high-temperature resistant zinc alloy sacrificial anode has impurity iron less than or equal to 0.09 percent, impurity copper less than or equal to 0.03 percent and impurity cadmium less than or equal to 0.02 percent.

The preparation method of the high-temperature resistant zinc alloy sacrificial anode comprises the following steps:

(1) smelting a zinc ingot to obtain zinc liquid, covering a graphite layer above the zinc liquid, and continuously introducing inert gas for protection in the smelting process;

(2) after the zinc liquid is kept warm for 30-35 min, adding indium, nickel and zirconium wrapped by aluminum foil into the zinc liquid until the indium, the nickel and the zirconium are completely melted, and then adding zinc-magnesium alloy and aluminum-silicon alloy; stirring uniformly, slagging off, and keeping the temperature for 3-3.5 hours to obtain a mixed solution;

(3) and (3) casting and molding the mixed solution in a mold at 580-620 ℃, and cooling to room temperature.

Preferably, in the step (1), the heating temperature of the zinc ingot is 530-580 ℃, and the added inert gas is nitrogen.

Preferably, in the step (2), the metal indium, nickel and zirconium are dried at 100-120 ℃ before being added, so as to remove moisture.

Preferably, in the step (2), the content of the magnesium element in the zinc-magnesium alloy is 40-70%.

Preferably, in the step (2), the content of the silicon element in the aluminum-silicon alloy is 8-20%.

Preferably, the zinc alloy sacrificial anode has the current efficiency higher than 92 percent, the open circuit potential of-1.02 to-1.05V and the capacitance more than or equal to 1000 A.h/kg under the high-temperature condition of 75 to 80 ℃.

The invention has the advantages that: the high-temperature-resistant zinc alloy sacrificial anode consists of zinc, aluminum, indium, magnesium, nickel, zirconium and silicon; the mass percent of the aluminum is 0.5-1.2%; the mass percentage of the indium is 0.20-0.25%; the mass percent of the magnesium is 0.5-1.2%; the mass percent of the nickel is 0.05-0.2%; the mass percent of the zirconium is 0.05-0.08%; the mass percent of the silicon is 0.80-1.20%; the balance being zinc. The high-temperature-resistant zinc alloy sacrificial anode is added with zirconium element on the basis of the traditional zinc alloy, so that the electrochemical performance and the corrosion resistance of the zinc alloy at high temperature can be obviously improved; the zinc alloy sacrificial anode has the current efficiency higher than 92 percent, the open circuit potential of-1.02 to-1.05V and the capacitance more than or equal to 1000 A.h/kg under the high temperature condition of 75 to 80 ℃.

Detailed Description