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Method for chrome-nickel-molybdenum composite electroplating of thread surface of pipe joint special for oil well pipe

A composite electroplating and thread surface technology, applied in the field of metal pipe surface treatment

Active Publication Date: 2011-06-29
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Cr is also better at inhibiting hydrogen sulfide corrosion at low temperature, but not as good as Ni

Method used

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  • Method for chrome-nickel-molybdenum composite electroplating of thread surface of pipe joint special for oil well pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] In an embodiment, its specific process and steps are as follows:

[0027] (1) Design the raw material formula of the composite electroplating solution

[0028] CrCl 3 .6H2O 20 g, Na 2 MoO 4 .2H 2 O 10g,

[0029] NiCl.6H 2 O 50 g, Na 4 P 2 o 7 .10H 2 O 30 g,

[0030] N 2 h 4 .H 2 SO 4 1g, NaHCO 3 10g,

[0031] CH 3 COONa.3H 2 O 10 g, SrSO 4 1g,

[0032] Deionized water 1L;

[0033] The above electroplating solution uses H 2 SO 4 Adjust its pH value to 4~5; where Cr 3+ / Ni 2+ / MoO 4 2- The equivalent concentration ratio is 3 / 5 / 2; the electroplating solution is made of chemically pure reagents and deionized water;

[0034] (2) Process of composite electroplating

[0035] (a) Pre-treat the surface of the threaded surface of the oil well pipe special pipe joint to be treated by conventional methods. The process flow is: flowing cold water washing—chemical degreasing—hot water washing—flowing cold water washing—weak cor...

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Abstract

The invention relates to a method for chrome-nickel-molybdenum composite electroplating of a thread surface of a pipe joint special for an oil well pipe, and belongs to the technical field of metal pipe surface treatment. The method is characterized in that: novel chrome-nickel-molybdenum composite electroplating solution is adopted, wherein the equivalent concentration ratio of Cr3+ / Ni2+ / MoO42- is (1-3) / 5 / (1-3); in an electroplating process, the current density is 10-30A / dm<2>, the temperature of the electroplating solution is 40 to 60DEG C, and the electroplating time is 2 to 3 hours; and finally, a chrome-nickel-molybdenum composite coating is formed on the thread surface of the pipe joint. The thread surface of the pipe joint of the oil well pipe, which is treated by the method, has the carrier density and weight loss farther lower than those of a non-electroplated thread surface of a pipe joint. Therefore, the threads of the pipe joint special for the oil well pipe, which are subjected to chrome-nickel-molybdenum composite electroplating treatment, have high corrosion resistance.

Description

technical field [0001] The invention relates to a method for compound electroplating of chromium, nickel and molybdenum on the threaded surface of special pipe joints for oil well pipes, belonging to the technical field of metal pipe surface treatment. Background technique [0002] my country's oil and natural gas exploration and development efforts are continuously increasing, and the number of drilling wells is maintained at a relatively high level every year. The drilling volume accounts for about 1 / 5 of the world's total. one. According to the plan of China National Petroleum Corporation, the company will drill 15,000 wells per year during the "Eleventh Five-Year Plan" period, with a footage of 23.3 million meters, and in 2010 it will reach 24.7 million meters. In the process of oil and gas exploration and development, a large amount of oil well tubing is consumed, which includes drill pipe and drill string components, casing and tubing. The connection of the oil well p...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/36
Inventor 钟庆东李振华王毅钮晓博吴红艳
Owner SHANGHAI UNIV
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