Protective coating of pipe wall, electroplating method and application

A coating and tube wall technology, which is applied to the protective coating of the tube wall and the electroplating method and application field, achieves the effects of being less prone to coating defects, reducing porosity and fully circulating

Inactive Publication Date: 2021-01-08
KARAMAY SHUANGXIN ANTICORROSION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem of anaerobic corrosion of sulfate-reducing bacteria on carbon steel and metals in production oil wells, the present invention provides a protective coating for pipe walls and an electroplating method and application. The role of microbial corrosion tends to be green, ecological and efficient

Method used

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  • Protective coating of pipe wall, electroplating method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides an electroplating method for a protective coating against sulfate-reducing bacteria corrosion. The coating is the inner coating of the oil pipe; the electroplating includes the method of flow electroplating, which is followed by rust removal, oil removal, pickling, neutralization and activation before the flow electroplating.

[0033] The specific process of the electroplating process in this embodiment is as follows:

[0034] High temperature degreasing→Inner wall derusting→Change tooling→Flowing degreasing→Flowing water washing→Flowing pickling→Flowing water washing→Flowing neutralization→Anode installation→Flowing water washing→Flowing activation→Flowing pure water washing→Semi-bright nickel plating→Flowing pure water washing → Bright copper electroplating → flowing pure water washing → highly dispersed bright nickel electroplating → flowing water washing → hanging → hydrogen removal treatment → packaging.

[0035] The main scheme and steps ...

Embodiment 2

[0048] With embodiment 1, the difference is that additives are added in the electroplating process, and the addition mode is that the first-stage additives are nickel sulfate 2.6kg / kAh, nickel carbonate 2.6kg / kAh, sodium lauryl sulfate 4g / kAh; the second-stage additives Copper sulfate 2.3kg / kAh, copper carbonate 2.1kg / kAh, polyethylene glycol 1.8g / kAh, sodium polydithiodipropane sulfonate 0.7g / kAh; the third stage additives are nickel sulfate 4.2kg / kAh, carbonic acid Nickel 2.2kg / kAh, sodium hypophosphite 80g / kAh, saccharin 23g / kAh, 1,4-butynediol 12g / kAh, coumarin 12g / kAh;

[0049] After adding 1 time, the resultant is composite coating B. The coating is uniform and the thickness error is 2%. The coating properties are shown in Table 1.

Embodiment 3

[0051] Same as Example 1, after adding 5 times according to the addition method of Example 2, the composite coating C was prepared. The coating is uniform and the thickness error is 3%. The coating properties are shown in Table 1.

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Abstract

The invention provides a protective coating corroded by sulfate reducing bacteria, an electroplating method and application. The protective coating is a three-layer composite coating; the composite coating comprises bottom-layer semi-bright nickel, middle-layer bright copper and outer-layer bright nickel; the potential of the bottom-layer semi-bright nickel is higher than that of the middle-layerbright copper by 120mV or above, and the potential of the middle-layer bright copper is higher than that of the outer-layer bright nickel by 60-100 mV; the electroplating method adopts a flowing electroplating mode; and an adding mode of an additive of electroplating liquid is to add the additive at a liquid outlet of a plating tank with electroplating current as metering reference. The protectivecoating is perfect in technological process, the additive is reasonably matched and used, multilayer corrosion prevention is performed on the inner walls of oil pipes and sleeves, and the corrosion of the sulfate reducing bacteria to pipe matrix can be effectively reduced.

Description

technical field [0001] The invention relates to the field of petroleum and mechanical engineering surface treatment, in particular to a protective coating for pipe walls and an electroplating method and application. Background technique [0002] People's understanding of microbial corrosion stems from the fact that the corrosion of pipes in oil wells, mines, seaports, and lakes is related to microbial activities. Sulfate-reducing bacteria (SRB) is the most common bacterial species that causes microbial corrosion. The existence of a large number of salt-reducing bacteria not only corrodes equipment, but also reduces the treatment efficiency of water treatment equipment. Sulfate-reducing bacteria cause economic losses in the tens of billions of dollars each year. Sulfate-reducing bacteria can accelerate the anaerobic corrosion of carbon steel, and the hydrogen ions released by its metabolite hydrogen sulfide under wet conditions are strong depolarizers, which accelerate the d...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D7/04C25D3/38C25D3/12
CPCC25D3/12C25D3/38C25D5/14C25D7/04
Inventor 张志超李代强郇承武邱桃倪小龙白杨刘红林孟祥伟
Owner KARAMAY SHUANGXIN ANTICORROSION TECH
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