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Aluminum alloy sacrificial anode suitable for deep sea environment and high in current efficiency

A sacrificial anode and deep-sea environment technology, applied in the field of anti-corrosion, can solve the problems of high cost, uneven dissolution, low current efficiency, etc., and achieve the effect of less environmental pollution, uniform dissolution, and easy shedding

Active Publication Date: 2014-09-24
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. The technical problem to be solved by the present invention is to provide a sacrificial anode suitable for the deep sea environment, and solve the problems of the existing sacrificial anode used in the deep sea such as unstable potential, low current efficiency, uneven dissolution and high cost

Method used

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  • Aluminum alloy sacrificial anode suitable for deep sea environment and high in current efficiency
  • Aluminum alloy sacrificial anode suitable for deep sea environment and high in current efficiency

Examples

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Embodiment 1

[0009] Embodiment 1: The label is sample D1.

[0010] Using aluminum as the matrix, adding zinc, indium, tin, magnesium and titanium alloy elements to form a six-component alloy, the specific composition ratio: (wt%): zinc 6.0%, indium 0.020%, tin 0.05%, magnesium 0.5%, titanium 0.05%, of which impurity iron 2 The working area of ​​making the used experimental sample of the present invention. The open circuit potential of the sacrificial anode in the deep sea environment is -1.100V (vs, Ag / AgCl, saturated KCl solution), the working potential is -1.076V (vs, Ag / AgCl, saturated KCl solution), and the current efficiency is 92.56%. The capacity is 2633A·h / kg. Dissolve evenly, corrosion products are easy to fall off.

Embodiment 2

[0011] Embodiment 2: the label is sample D2.

[0012] Using aluminum as the matrix, adding zinc, indium, tin, magnesium and titanium alloy elements to form a six-component alloy, the specific composition ratio: (wt%): zinc 5.8%, indium 0.025%, tin 0.05%, magnesium 1.0%, titanium 0.10%, of which impurity iron 2 The working area of ​​making the used experimental sample of the present invention. The open circuit potential of the sacrificial anode in the deep sea environment is -1.103V (vs, Ag / AgCl, saturated KCl solution), the working potential is -1.048V (vs, Ag / AgCl, saturated KCl solution), and the current efficiency is 93.75%. The capacity is 2662A·h / kg. Dissolve evenly, corrosion products are easy to fall off.

Embodiment 3

[0013] Embodiment three: the label is sample D3.

[0014] Using aluminum as the matrix, adding zinc, indium, tin, magnesium and titanium alloy elements to form a six-component alloy, the specific composition ratio: (wt%): zinc 5.6%, indium 0.020%, tin 0.10%, magnesium 0.5%, titanium 0.10%, of which impurity iron 2 The working area of ​​making the used experimental sample of the present invention. The open circuit potential of the sacrificial anode in the deep sea environment is -1.100V (vs, Ag / AgCl, saturated KCl solution), the working potential is -1.076V (vs, Ag / AgCl, saturated KCl solution), and the current efficiency is 93.02%. The capacity is 2644A·h / kg. Dissolve evenly, corrosion products are easy to fall off.

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Abstract

The invention belongs to the technical field of corrosion prevention, and particularly relates to an aluminum alloy sacrificial anode suitable for the deep sea environment and high in current efficiency. According to the sacrificial anode, with aluminum as the matrix, 4.0-6.0wt% of zinc, 0.020-0.030wt% of indium, 0.05-0.10wt% of tin, 0.5-1.0wt% of magnesium and 0.05-1.0wt% of titanium are added, wherein the weight percentage of iron impurities is smaller than 0.050wt%, the weight percentage of copper is smaller than 0.010wt%, and the balance is the aluminum. The sacrificial anode is manufactured in a vacuum melting mode. As is shown in tests carried out in a simulated deep sea environment, the current efficiency of the sacrificial anode is larger than 92%, the open circuit potential of the sacrificial anode ranges from -1.05 to -1.20, the activation performance is good, dissolution is uniform, and corrosion products can fall off easily. The sacrificial anode can be applied to cathode protection for metal components used in the deep sea environment.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion, and in particular relates to an aluminum alloy sacrificial anode with high current efficiency suitable for deep sea environments. Background technique [0002] The cathodic protection method of sacrificial anode is a protection method commonly used in corrosion protection at present. The basic principle is to connect the sacrificial anode material and the protected material together, the potential of the sacrificial anode material is lower than that of the protected metal, relying on the potential difference between the sacrificial anode and the protected metal and the current provided by the continuous corrosion and dissolution of the sacrificial anode to make the protected material Cathodic polarization occurs in the protective metal, so that the corrosion of the protected metal is inhibited. In a nutshell, the corrosion of the anode material is accelerated and the corrosion of the catho...

Claims

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Application Information

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IPC IPC(8): C23F13/14C22C21/10
Inventor 李晓刚杜翠薇吴晓光范友军刘福国
Owner UNIV OF SCI & TECH BEIJING
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