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Organic top coating double-layer protecting method for galvanized steel fasteners

A technology for organic coatings and fasteners, applied to threaded fasteners, coatings, connecting components, etc., can solve the problems that cannot meet the application of steel fasteners, achieve slowing down of anode corrosion rate, neutral salt resistance The effect of good fog and good corrosion resistance in marine environment

Inactive Publication Date: 2015-04-01
沈阳市航达科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address some surface protection methods such as electro-galvanizing and hot-dip galvanizing, which cannot meet the application of steel fasteners in harsh environments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] To clean the surface of fasteners made of galvanized steel, first soak in alkaline degreasing solution for degreasing, then wash with a large amount of water, then soak in acid derusting solution for derusting, wash and dry in large quantities. The purpose is to remove the attachments on the surface of the fasteners, and the quality of the surface treatment is to achieve no dust, no grease, no dirt, no rust attachments. The quality control of surface treatment shall meet the requirements of the standard of "Steel Surface Corrosion Level and Derusting Level Before Painting" (GB8923-88).

[0022] The alkaline degreasing liquid used is mixed with sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0023] Sodium hydroxide 10 g / L; sodium carbonate 50 g / L; trisodium phosphate 60 g / L; sodium silicate 7 g / L; OP-10 emulsifier 3 g / L; the rest is water.

[0024] The acid rust removal solu...

Embodiment 2

[0033] To clean the surface of fasteners made of galvanized steel, first soak and degrease them in an alkaline degreasing solution, then wash them with a large amount of water, then soak them in an acidic derusting solution, wash and dry them with a large amount of water. The purpose is to remove the attachments on the surface of the fasteners, and the quality of the surface treatment is to achieve no dust, no grease, no dirt, no rust attachments. The quality control of surface treatment shall meet the requirements of the standard of "Steel Surface Corrosion Level and Derusting Level Before Painting" (GB8923-88).

[0034] The alkaline degreasing liquid used is mixed with sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0035] Sodium hydroxide 10 g / L; sodium carbonate 50 g / L; trisodium phosphate 60 g / L; sodium silicate 7 g / L; OP-10 emulsifier 3 g / L; the rest is water.

[0036] The a...

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Abstract

The invention relates to an organic top coating double-layer protecting method for galvanized steel fasteners, which is characterized by comprising the steps of carrying out surface oil and rust removing on the galvanized steel fasteners and carrying out surface top coating on the treated galvanized steel fasteners, wherein the dip-coating centrifugal process is adopted in the coating and the viscosity number of the top coating is controlled at 14-18s / 4 cups at the temperature of 25 DEG C; and drying the fasters after being subjected to the dip-coating centrifugal coating for 10-20 minutes in a drying furnace at the temperature of 80-100 DEG C, heating to 220-280 DEG C along with the furnace, holding the temperature for 30-50 minutes and solidifying. The method disclosed by the invention has the advantages that when the coating thickness is less than or equal to 15 micrometers, the neutral salt mist resisting time can be up to 1500 hours under the condition of satisfying the assembly tolerance requirements of the fasteners; the better corrosion resistance is provided; and the better abrasion resistance is also achieved at the same time.

Description

technical field [0001] The invention relates to a surface protection technology for iron and steel fasteners, in particular to a double-layer protection method applied to the organic coating top coating of galvanized iron and steel fasteners. Background technique [0002] The marine environment is one of the most corrosive environments in nature, and most metal materials are not resistant to seawater, ocean and atmospheric corrosion. Many threaded fasteners exposed to the marine environment for a long time are severely corroded. Corrosion makes the fasteners difficult to disassemble, reduces the connection strength, and even fails, which causes great difficulties for the normal service and maintenance of the fasteners. [0003] Through the analysis of fastener materials, structural characteristics, service conditions and other factors, combined with the corrosion characteristics of the marine environment, threaded fasteners mainly have various corrosion types such as crevice...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/16B05D3/00B05D1/18C23G1/08C09D163/00C09D7/12C09D5/00F16B35/00
Inventor 殷跃军李庆鹏管勇刘建国严川伟
Owner 沈阳市航达科技有限责任公司
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