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Pre-treating technique for composite metal plastic pipe

A steel-plastic composite pipe and pretreatment technology, applied in the direction of pretreatment surface, metal material coating process, device for coating liquid on the surface, etc., to achieve the effect of simple and convenient operation, improving adhesion and ensuring quality

Active Publication Date: 2010-03-17
GUANGDONG LIANSU TECH INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no report on the application of phosphating process, especially the zinc-based phosphating process at room temperature and low temperature, to the pretreatment of steel-plastic composite pipes.

Method used

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  • Pre-treating technique for composite metal plastic pipe

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with specific examples, but the specific examples do not limit the present invention in any way.

[0051] The steel-plastic composite pipe pretreatment process of the present invention follows the process of "grease removal→water washing→pickling→water washing→neutralization→water washing→surface conditioning→phosphating→water washing→surface conditioning→drying". The steel pipes are placed in various treatment tanks in turn, and after being treated for a period of time, they are taken out and entered into the next treatment tank, so as to complete the goals of degreasing, rust removal and phosphating in turn. The distribution of the tank body of the present invention is as follows figure 1 shown.

[0052] Such as figure 1 As shown, the degreasing tank, water washing tank, acid tank, water washing tank, neutralization tank, water washing tank, surface conditioning tank, phosphating tank, water washing...

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PUM

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Abstract

The invention discloses a pre-treating technique for a composite metal plastic pipe which pre-treats a steel tube with a parkerizing process. The treating process orderly consists of removing grease,washing with water, washing with acid, washing with water, neutralizing, washing with water, regulating surface, parkerizing, washing with water, regulating surface and drying. By pre-treating a composite metal plastic pipe with the parkerizing process, the invention not only solves the rust-proof and rot-proof problems in the middle processes of the composite metal plastic pipe, but also promotesthe adhesive attraction of the macromolecular powder doped plastic-coated steel tube. By adopting dipping mode, with simple and convenient operation, the invention can treat the worepieces with various geometrical shapes. The invention can obtain an excellent effect which the spraying and printing techniques cannot obtain. According to the characteristic of the composite metal plastic pipe, the invention optimizes the parameters in parkerizing process and detects and maintains during the pre-treating process, to ensure that the whole treating process can be finished under any condition and toensure the quality during the pre-treating process.

Description

technical field [0001] The invention relates to the technical field of steel-plastic composite pipes, in particular to a pretreatment process for steel-plastic composite pipes. Background technique [0002] The steel-plastic composite pipe is based on seamless steel pipe or welded steel pipe, and the inner wall is coated with high-adhesion, anti-corrosion, food-grade hygienic polyethylene powder coating or epoxy resin coating. It adopts pretreatment, preheating, coating, Leveling (or curing) and post-treatment galvanized plastic-coated composite steel pipes for water supply or internally and externally sprayed composite steel pipes for gas and fire protection are upgraded products of traditional galvanized pipes. [0003] At present, in the field of pretreatment of steel-plastic composite pipes, the domestic process adopts sandblasting and anti-rust treatment on the steel pipes, and then sprays the polymer powder coating evenly on the surface of the pretreated steel pipes, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42B05D3/10B05D7/14B05D7/22
Inventor 文巍伟
Owner GUANGDONG LIANSU TECH INDAL
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