A kind of transmission line pole tower long-lasting anticorrosion coating and preparation technology thereof
Technical field
It is anticorrosion that the hot dip process technical field that belongs to power sector electric power line pole tower metallic substance, this invention are mainly used in the surface heat immersion plating of electric power line pole tower of power sector.
Background technology
According to the data that Chinese corrosion and protection association provides, Chinese annual steel corrosion loss is about 5,000 hundred million yuan, accounts for 6% of gross national product, if take effective safeguard procedures can make loss reduce 20-30%.The hot dip technology provides the good anti-atomospheric corrosion method of iron and steel.
The aseptic technic of electric power line pole tower mainly is a galvanizing, under ocean environment, also adopts the method for paint and anticorrosion with coat technology and usefulness simultaneously.Electric power line pole tower occupies very big proportion in steelwork, the factory that zinc-plated ability is bigger all is distributed in electric power pylon manufacturing concern.Therefore, the raising of electric power line pole tower long-effective corrosion state of the art for the corrosion that reduces steel, prolongs the electric power line pole tower Years Of Service, improves the input-output ratio of transmitting line, and benefit very significantly.
Through in zinc liquid, adding the method for alloying constituent, at steel surface deposition one deck alloy layer, improve the corrosion resistance nature of hot-dip coating in the hot dip process; Thereby improve the protection against corrosion life-span that hot dip process makes up, reduce thickness of coating, both improved the corrosion fatigue life of hot dip process member; Practice thrift the consumption of plating bath; Economize on resources and the energy, reduce discharging, have high economic and social benefit.Therefore, the hot-dip coated research worldwide of alloy is more active.The alloy layer that occurs at present has al-zn alloy coating; Zn-ni alloy deposits; Zinc titanium alloy coating etc., its purpose is to control the activity of silicon in the galvanizing process, has also obtained certain effect aspect the life-span at raising coating; But owing to reasons such as cost is high, and technology is immature all do not obtain large-scale promotion and application.
Atmospheric environment changes at present; Corrosive gases such as sulfide, oxynitride content increases in the atmosphere, and the ocean environment seriously corroded of coastland is accelerated in the electric power line pole tower corrosion under the acid rain environment; Transmitting line every two years all will carry out rotproofing once more; Cost is higher, the processing that also need have a power failure simultaneously, and financial loss is serious.Development and exploitation are suitable for the alloy layer of electric power line pole tower long-effective corrosion, technical and better economy, improve the anticorrosion life-span of electric power line pole tower under complicated corrosion working conditions, and it is anticorrosion significant with running cost to reduce transmitting line.
The present invention has developed used for hot dip galvanizing zinc-aluminum-magnesium rare earth alloy plating bath and the alloy layer that is used for the electric power line pole tower long-effective corrosion, and electric power line pole tower adopts the hot dip process of zinc-aluminum-magnesium rare earth alloy plating bath and this alloy layer that obtains also not to appear in the newspapers in the document under complicated corrosion working conditions at home and abroad.
Summary of the invention
The present invention mainly is devoted to improve the hot-dip coated protection against corrosion life-span of power sector electric power line pole tower.Because the corrosion resistance of alloy ratio pure metal is strong, therefore adopt the method for alloying, designed suitable coating alloy system, solve the hot-dip coated alloying problem of electric power line pole tower.The present invention provides a kind of electric power pylon anti-sulfur-bearing atomospheric corrosion, acid rain corrosion and coating alloy system in ocean environment corrosive long-effective corrosion life-span under complicated corrosion working conditions of being suitable for, and the protection against corrosion life-span is more than 2 times of hot dipping pure zinc plating.
A kind of transmission line pole tower long-lasting anticorrosion coating is characterized in that, has the alloying element of following mass content in the alloy layer: zinc: 32~55%, and aluminium: 43~65%, magnesium: 0.5~8%, rare earth nickel: 0.5~3%, titanium: 0.01~0.2%.
Wherein each composition effect is following:
Zinc: main alloying constituent, form alloy layer, in corrosion process, sacrifice himself, guard bar tower structure spare matrix metal.
Aluminium: main alloying constituent, form intermetallic compound with zinc etc., improve corrosion resistance nature.In the hot dip process process, aluminium in the alloy crystal process of growth, on float to the surface of coating, generate alumina protective layer resistance corrosive in the corrosion process and further carry out, the protection against corrosion advantage of performance aluminium improves the corrosion fatigue life of whole coating.
Magnesium: micro alloying element, the erosion resistance of raising coating.
Rare earth nickel: micro alloying element, improve the performance of coating alloy, refinement coating alloy grain is eliminated the harm of impurity in the coated metal, improves the corrosion resistance nature of coating.
Titanium: micro alloying element, the corrosion resistance of raising coating, the protection against corrosion advantage of performance titanium alloy.
Existing or immersion equipment is adopted in the preparation of alloy layer of the present invention, mainly contains following steps:
Plating piece carries out preceding the taking off rust, degreasing, help plating and dry processing of hot dip process;
Plating piece is put in the plating bath according to the alloy formula of above-mentioned transmission line pole tower long-lasting anticorrosion coating 430 ℃-450 ℃ of bath temperatures, immersion plating plating 3~10 minutes;
Plating piece is taken out from the hot dip process pot, be put into passivation in the passivating solution;
The plating piece that passivation is good cleans, packing.
This alloy layer, or immersion is easy, and existing pot galvanize equipment can satisfy the production needs fully; The hot plating technology temperature reduces by 20~40 ℃ than existing zinc-plated temperature; Pre-process and post-process can adopt the treatment process of existing pot galvanize, and plating back any surface finish is high, and alloy layer thickness is even; Thickness of coating is greater than 86 μ m, 3~10 minutes hot dip process time.
Embodiment
All embodiments all are to adopt existing or immersion equipment, according to all process steps in front:
Adopting alloying constituent is the alloy immersion plating liquid of table 1, and 430 ℃ of bath temperatures, hot dip angle steel are L100 * 4, and 3 minutes immersion plating time Coating composition is seen table 1, thickness of coating, 95 μ m.
Adopt the alloy immersion plating liquid of table 2,440 ℃ of bath temperatures, hot dip process angle steel L200 * 10,6 minutes immersion plating time, Coating composition is seen table 2, thickness of coating 105 μ m.
Adopt the alloy immersion plating liquid of table 3,450 ℃ of bath temperatures, hot dip process angle steel L400 * 15,10 minutes immersion plating time, Coating composition is seen table 3, thickness of coating 116 μ m.
The alloying constituent of table 1 plating bath (wt%)
Zn |
Al |
Mg |
Rare earth nickel |
Ti |
35 |
53.9 |
8 |
3 |
0.1 |
The alloying constituent of table 2 plating bath (wt%)
Zn |
Al |
Mg |
Rare earth nickel |
Ti |
55 |
43 |
0.5 |
1.3 |
0.2 |
The alloying constituent of table 3 plating bath (wt%)
Zn |
Al |
Mg |
Rare earth nickel |
Ti |
32 |
65 |
2.49 |
0.5 |
0.01 |
Rare earth nickel
Ni |
Ce/R |
La/R |
Pr/R |
Nd/R |
Fe |
44.372 |
8.76 |
24.54 |
5.41 |
16.17 |
0.1 |
Si |
P |
Ca |
Mn |
Mg |
|
0.025 |
0.003 |
0.01 |
0.1 |
0.51 |
This alloy layer, or immersion is easy, and existing pot galvanize equipment can satisfy the production needs fully; The hot plating technology temperature reduces by 20~40 ℃ than existing zinc-plated temperature; Pre-process and post-process can adopt the treatment process of existing pot galvanize, and plating back any surface finish is high, and alloy layer thickness is even; Thickness of coating is greater than 86m, 3~10 minutes hot dip process time.The protection against corrosion life-span is more than 2 times of hot dipping pure zinc plating.