Basic zincic acid salt plating liquor, its electroplating method and long steel-pipe with electroplated zinc nickel alloy

A technology of electroplating zinc-nickel and zincate, which is applied in the field of alloy electroplating, which can solve the problems of uneven coating and poor coating, and achieve the effect of uniform coating, no missing plating, and low corrosion of equipment

Inactive Publication Date: 2006-03-15
PETRO OIL & LUBRICANT RES INST OF THE GENERAL LOGISITIC DEPT OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] 1. The groove (2) and end face (3) on the outer surface of the socket are hardly coated;
[0015] 2. There is almost no coating in the mouth;
[0016] 3. Uneven coating

Method used

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  • Basic zincic acid salt plating liquor, its electroplating method and long steel-pipe with electroplated zinc nickel alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: The plated piece is a Φ15×100 mm steel pipe with one end closed.

[0039] According to the formulation of the plating solution of the present invention, the cathode current density is 2 amps / dm2, and electroplating is performed at 25° C. for 30 minutes. The depth of the inner coating of the test steel pipe is 15.3 to 16 mm, which shows that the dispersion ability of the plating solution is very good.

Embodiment 2

[0040] Embodiment 2: The plated part is a socket steel pipe with a length of 6 meters and a diameter of 152 mm, and the ratio of the wall thickness of the socket to the wall thickness of the pipe body is greater than 6.

[0041] According to the plating solution formula and process operating conditions of the present invention, and the auxiliary anode is set at the appropriate position of the steel pipe, the outer surface of the obtained coating is bright stainless steel, the coating is uniform, the nickel content in the coating is about 10%, and its corrosion resistance is the same thickness 2.8 times that of zinc coating, the hardness is 1.9 times that of zinc coating of the same thickness.

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Abstract

The invention is about the alkali zincate plating liquid which contain: 8-12g/L ZnO; 80-140g/L NaOH; 8-10g/L NiSO4íñ6H2O; 4-6mL/L N2-918A; 2-4mL/L of N2-918B; 50-70mL/L of N2-918C.Also the invention provided the process to plate Zn-Ni alloy to steel pipe which concludes de-oiling, washing, installing endo-anode, plating, unloading endo-anode, washing and airing. The process is used to the complex long steel pipe especially. The Ni content is 10% and the erosion resistance is 2.8 times than the others, the rigidity is 1.9 times.

Description

technical field [0001] The invention relates to an alloy electroplating technology, in particular to an alkaline electroplating zinc-nickel alloy process. Background technique [0002] At present, the protective coating widely used on steel is mainly zinc coating, accounting for about 70% of the total domestic electroplating. However, the zinc-coated metal has strong mobility and a fast corrosion rate. To obtain a long-term protective effect, the thickness of the coating must be increased. This not only needs to consume a lot of energy, but also the thick plating brings inconvenience to the processing. With the development of the times and the advancement of technology, the requirements for energy saving and environmental protection of the electroplating process are getting higher and higher, and the quality requirements for the protective coating are also getting higher and higher. The traditional zinc coating can no longer fully meet the requirements. With the research a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D7/04
Inventor 宋花平崔虹李贵银张文国何建设袁长友吴玉林
Owner PETRO OIL & LUBRICANT RES INST OF THE GENERAL LOGISITIC DEPT OF PLA
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