Alloy sacrificial anode film preventing stress corrosion cracking and preparation method thereof

A technology of stress corrosion cracking and sacrificial anode, applied in the field of alloy film, can solve the problem of no unified definition, and achieve the effect of good adhesion

Active Publication Date: 2010-12-29
大连天凡防腐工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Most of the steel used for pressure vessels in my country is low-alloy high-strength steel. At present, there is no unified definition of low-alloy high-strength steel

Method used

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  • Alloy sacrificial anode film preventing stress corrosion cracking and preparation method thereof

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Effect test

Embodiment 1

[0057] Alloyed sacrificial anode film to prevent stress corrosion cracking, which contains aluminum, magnesium, titanium and rare earth elements in the zinc-based alloy, the weight percentage of each element in the zinc-based alloy is: zinc 84.022%, aluminum 14%, lanthanum 0.5% , cerium and praseodymium 0.4%, magnesium 1.0%, titanium 0.008%, iron and manganese 0.05%, carbon 0.02%.

[0058] Alloy production method: Add aluminum, magnesium, titanium and rare earth elements in batches according to different melting points in different order and time (according to the order of melting point from small to large, adding when reaching the melting point temperature) into the special smelting furnace, out of the furnace and pouring Make ingots into special molds, then heat preservation, constant temperature, and cooling in an inert gas environment, and then process them into rods of 8mm-12mm after reaching room temperature, and the rods are drawn into wires of φ2mm-3mm , the method of ...

Embodiment 2

[0061] An alloyed sacrificial anode film to prevent stress corrosion cracking, which contains aluminum, magnesium, titanium and rare earth elements in a zinc-based alloy. The weight percentage of each element in the zinc-based alloy is: zinc 83%, aluminum 15.335%, lanthanum 0.8% , cerium and praseodymium 0.2%, indium 0.05%, magnesium 0.5%, titanium 0.025%, iron and manganese 0.08%, carbon 0.01%.

[0062] Alloy manufacturing method and coating thermal spraying method are as in Example 1.

Embodiment 3

[0064] An alloyed sacrificial anode film to prevent stress corrosion cracking, which contains aluminum, magnesium, titanium and rare earth elements in a zinc-based alloy. The weight percentage of each element in the zinc-based alloy is: zinc 83.714%, aluminum 14.5%, lanthanum 0.3% , cerium and praseodymium 0.6%, indium 0.03%, magnesium 0.8%, titanium 0.018%, iron and manganese 0.03%, carbon 0.008%.

[0065] Alloy manufacturing method and coating thermal spraying method are as in Example 1.

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Abstract

The invention relates to an alloy film, in particular to an anticorrosive alloy plated film. The invention also relates to a preparation method of an alloy. An alloy sacrificial anode film for preventing stress corrosion cracking is made of an aluminum, magnesium, titanium and rare-earth element-containing zinc-based alloy. As a CPF metal coating of the invention has triple corrosion prevention forms different from the conventional corrosion prevention form by using a single metal, namely a capture effect, a self-sealing effect and a static bed effect, the alloy sacrificial anode film has the corrosion prevention effect (making the best use of the circumstances) different from the past. Simultaneously, as the bonding of a metal thermal spray coating and a steel substrate is semi-molten metallurgical bonding and mechanical bond bonding, the bonding force is greater than that of an organic coating and the steel substrate. By adopting a special sealing agent, the alloy sacrificial anode film can bear a potential voltage of -1.33v, and has high oil resistance, high alkali resistance and high adhesion, and does not generate cathodic disbanding due to bubbling caused by OH<-> or H<+> generated by cathodic reaction under the coating.

Description

technical field [0001] The invention relates to an alloy film, especially an anti-corrosion alloy film, and also relates to a method for preparing the alloy. Background technique [0002] When steel is used in certain medium environments, stress corrosion cracking (ie SCC) will occur. Generally speaking, the higher the strength of steel, the more sensitive it is to stress corrosion. Common stress corrosion environments in production mainly include wet H 2 S, 8 categories such as anhydrous liquid ammonia, nitrate, carbonate, hydroxide, cyanide and carbon dioxide. In refinery production, especially in recent years with the increase of refined crude oil, wet H 2 S stress corrosion cracking is particularly serious. [0003] Most of the steel used for pressure vessels in my country is low-alloy high-strength steel. At present, there is no unified definition of low-alloy high-strength steel. It is generally considered that the total amount of alloying elements added on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14C23C4/08C23C4/131
Inventor 邹积强
Owner 大连天凡防腐工程有限公司
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