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Double-layer copper brazing steel tube coated with zinc on external side and coated nickel on PVF inside

A double-layer pipe and brazing technology, which is applied in the direction of coating, metal material coating process, pipeline protection, etc., can solve the problems that double-layer pipe cannot provide resistance, cost increase, labor and time loss, etc.

Inactive Publication Date: 2008-05-14
班特管业工贸公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the double-layer pipe does not provide the desired resistance
Also, at the manufacturing stage of the tubes, additional labor and time losses occur, thus increasing costs

Method used

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  • Double-layer copper brazing steel tube coated with zinc on external side and coated nickel on PVF inside
  • Double-layer copper brazing steel tube coated with zinc on external side and coated nickel on PVF inside

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Preparation of Plating Solution

[0048] Table 1. Content ratio of plating solution

[0049] content

The preferred weight contains

volume ratio

available weight content

Compare

nickel

％20

％15-％25

Hypophosphite (Hydro-phosphite)

％20

％15-％25

Demineralized water (conductivity<10μS)

％50

％50-％60

Sodium Carbonate (stabilizer)

％10

％5-％15

[0050] In order to stabilize the pH of the electroless nickel plating solution, if a stabilizer is added, the amount of water added should not be more than 50%.

[0051] An example of the amount of nickel plating solution by weight is given below.

example

[0053] Nickel: 120g / lt

[0054] Hypophosphite: 648g / lt

[0055] Sodium carbonate (stabilizer): 75g / lt

[0056] Prior to preparation of the electroless nickel plating bath (10), all equipment that will be subjected to plating solution treatment is cleaned with nitric acid. All parts were then rinsed with a spray of regular distilled water. After washing, the amount of water subjected to filtration is controlled. The conductivity of the water should not exceed 10 μS.

[0057] Fill the tank with the required volume of distilled water with a conductivity of 5 μS and operate the filtration system. The bath forming chemicals are added to the currentless nickel plating bath (10). It is heated to operating temperature and the pH is controlled.

[0058] After careful preliminary preparation, the part to be plated with galvanic nickel is placed in the galvanic nickel plating bath (10) and waits until a nickel layer (5) of the desired thickness is formed. In order to increase the ...

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PUM

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Abstract

The invention relates to a double-layer tube (1) which has high corrosion resistance intensity and high tolerance, as well as a method for producing the double-layer tube. The double-layer tube (1) comprises a copper-welding steel-plate tube (2) which is obtained by forming a zinc layer (3) on the outer surface and a nickel layer (5) on the inner surface of a copper-welding steel-plate tube (3). The method comprises the steps as follow: the copper-welding steel-plate tube (2) whose outer surface is plated with zinc and PVF (polyfluoroethylene) is cleaned in the cleaning section (7) of a current-free nickel plating production line (6); washed in a washing bath (8); activated in an activation section (9); plated with nickel plating solution on the inner surface in a current-free nickel plating bath (10); cleaned again; dried in a drying section (11); and then the copper-welding steel-plate tube (2) is leakage-tested, and finally packaged and delivered.

Description

technical field [0001] The present invention relates to a double-layer pipe having high corrosion resistance strength and resistance by forming a nickel layer on the inner surface of a brazed steel sheet pipe coated with zinc and PVF (polyvinyl fluoride) on the outer surface, and a manufacturing method thereof get. [0002] The double-layer pipe manufacturing method developed by the present invention includes the following steps: cleaning copper welded steel sheet pipe (copperweld steel sheet pipe) with zinc and PVF plated outer surface in the cleaning section on the currentless nickel plating production line; rinsing in the middle; activation treatment in the activation section; plating the inner surface of the brazed steel pipe with nickel plating solution in a currentless nickel plating bath; rinsing again in the cleaning bath; drying in the drying section; leak test ;Packaged and ready to ship. Background technique [0003] In the prior art, double brazed steel sheet p...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C18/36B32B5/00
CPCF16L58/08
Inventor 伊斯梅·岑克
Owner 班特管业工贸公司