Method for preparing corrosion-protection composite coating for the steel metalwork

A composite coating, metal parts technology, applied in anti-corrosion coatings, coatings, devices for coating liquids on surfaces, etc. , to achieve the effect of enhancing the protection ability, improving the anti-corrosion performance and comprehensive performance, and improving the waterproof performance.

Active Publication Date: 2008-02-06
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
View PDF0 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned zinc-chromium coatings have good corrosion resistance in ordinary atmospheric environments, it is difficult to meet the requirements for use in water environments or highly corrosive marine environments, because an important factor for the high corrosion resistance of such coatings is The reason is that the trace amount of soluble hexavalent chromium contained in the coating can provide repassivation ability and self-healing effect for the coating. It will be dissolved from the coating, and the anti-corrosion performance o

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Taking the carbon steel marine screw fastener as a sample, the composite coating is prepared by soaking, centrifugally drying, and curing processes using the scheme of the present invention. The technical parameters of drying and sintering curing are shown in Table 2, and the average The thickness is 15μm, the binding force is grade 1, and no red rust appears after 1000 hours of neutral salt spray corrosion test. After soaking in static seawater for 1.5 years, the sample substrate did not appear rusted, which met the specified technical effect requirements.

[0018] Table 2 Example 1 Composite coating curing process parameters

[0019] Process parameters

Embodiment 2

[0021] Using the carbon steel fastener provided by a certain ship as the substrate, the composite coating was prepared by dip coating, centrifugal drying, drying and sintering curing process using the scheme of the present invention. The technical parameters of drying and sintering curing treatment are shown in Table 3 , the bottom layer is two inorganic water-based zinc-aluminum coatings, and the surface is covered with an epoxy aluminum-rich organic coating. The average thickness of the composite coating is 15 μm. This type of fastener is applied to the hull, and it is soaked in seawater and wet, After one year of use in the high-salt marine atmospheric environment, the coating is intact, and the performance of the fastener substrate has not been significantly reduced, the surface is severely corroded, and the bolts are rusted.

[0022] Table 3 Example 2 Composite coating curing process parameters

[0023] Process parameters

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
The average thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to an anticorrosion composite coat for steel metal fastener used in the marine environment, the structure of the composite coat consists of a bottom layer and a surface layer, wherein the bottom layer is coated with lamellar metal zinc dust and lamellar metal aluminum powder which are adhered by adhesive and mixed together, the surface layer is coated with metal aluminum power and reshaping epoxy resin which are mixed together. The invention includes the procedures as follows: the lamellar metal zinc dust and the lamellar metal aluminum power are mixed, and then are added into the inorganic aquosity splicing agent to be stirred and mixed uniformly, and then are soaked into and coated on the anticorrosive metal steel pieces, then are processed by baking and sintering and solidifying to achieve the first step for coating the bottom layer, then the coating and solidifying process is repeated to achieve the second step for coating the bottom layer; additionally, the lamellar aluminum power and the reshaping epoxy resin are mixed to be the organism epoxy aluminium rich paint, the formed bottom layer is made into the surface layer by the different parameter and the same step of the first step of the bottom layer, the method of the invention is of high causticity and strong protection, thereby the base body of the steel fastener can be protected, and the invention is of good abradability, beautiful appearance and ideal decoration.

Description

Technical field: [0001] The invention relates to a metal surface anti-corrosion coating technology, in particular to an anti-corrosion composite coating for steel metal fasteners or connectors used in marine environments. Background technique: [0002] At present, the anti-corrosion measures for steel metal fasteners or connectors used in the marine environment at home and abroad mainly include electroplating cadmium, electrogalvanizing, hot-dip galvanizing and other technologies. Due to the toxicity of cadmium, the susceptibility to hydrogen embrittlement of electroplating, the aging performance of electroplated zinc passivation film at high temperature, and the insufficient corrosion resistance of hot galvanizing, the above-mentioned technologies cannot meet the growing demand for marine environment. Anti-corrosion requirements using steel metal fasteners. Therefore, the research of new technologies to replace the traditional anti-corrosion coating and coating technology ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B05D1/38B05D7/24C09D5/10C23F15/00
Inventor 李宁许立坤王洪仁
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap