Thermal sprayed metal ladder coating ccontrast with commonly used spraying technology and test
1 quality comparison
(1) spray zinc
Since the establishment of a company since 1975, its steel structure spray zinc anti-corrosion process many awards, long in the Yangtze River Gezhouba, Gansu Bikou power station, the National Sports Center in Senegal dozens of major projects at home and abroad to undertake steel structure spray zinc corrosion project Ten years of successful construction experience proved that the hydraulic steel structure spray zinc corrosion protection process protection period of 15 years or so, it has the advantage of corrosion performance can be stable, good effect, anti-permeability, the shortcomings of the surface hardness is poor, Lack of wear resistance, resistance to destruction of weak.
(2) spray stainless steel
According to the relevant information at home and abroad, stainless steel spray coating protection period of 45 years or so, its advantages are high hardness, good wear resistance, strength, good resistance to destruction, the disadvantage is poor spraying anti-corrosion effect, easy to rust, Protection, rough surface, strong water permeability, poor coverage, easy to peel off.
(3) thermal spray metal ladder coating
The process is the gradual development of new anti-corrosion technology, but in the underwater hydraulic steel corrosion has not yet been widely used to test the anti-corrosion effect of this new technology, made a test:
(A) plate, spray stainless steel (B) plate and metal ladder coating corrosion (C) board three steel test panels (A plate spray zinc thickness of 160μm, B board spray stainless steel thickness of 160μm C board spray Zinc thickness of 80μm, spray stainless steel thickness of 80μm) at the same time immersed in water, a few days later removed.
As a result, the A plate surface basically no change, with a small hammer gently hit, zinc layer by the impact, friction deformation, displacement, the surface of the exposed parts exposed.
B plate surface rust, rust water from the rough surface of stainless steel cracks in the seepage (because of its non-polished, corrosion in the hydraulic steel structure can not be polished, or not only difficult to build and the cost will be several times up), with a small Hammer gently hit the surface of stainless steel, hit part of the rust stripped, showing that the process due to the coating pores, water permeability, steel surface is still in contact with water and corrosion, it can not meet the needs of hydraulic steel underwater corrosion.
C board surface, intact as early as no rust, with a small hammer gently hit the stainless steel surface without wear, peeling, no deformation. It can be seen, thermal spray metal ladder coating corrosion effect is good.
Comparison of Economic Benefits
The stainless steel coating is hard and resistant to friction, and the protection period is up to 45 years. However, it is not applicable to the anti-corrosion of underwater engineering of hydraulic steel structure.
The use of spray-zinc process alone, although the initial investment than the use of stainless steel and thermal spraying metal step coating anti-corrosion process is low, but the poor wear resistance of zinc layer, the protection cycle is only 15 years, especially near the gate line and some Friction, erosion parts, zinc layer protection cycle will be shorter, 45 years to be repeated spraying more than 3 times, the project life cycle costs increased.
Thermal spray metal ladder coating
anti-corrosion technology, the coating wear-resistant, clean appearance, uniform coverage, dense, long protection period, good corrosion resistance, destructive, without the need for secondary construction, significantly reducing the project life cycle cost The Is the preferred hydraulic steel structure anti-corrosion technology.
China's rivers and lakes, the coastline is longer, more water conservancy projects, while the South-to-North Water Diversion Project will also build a large number of hydraulic buildings, hydraulic steel structure of a large number of anti-corrosion work surface. Hydraulic steel gate parts of the operation process, in the water, underwater, water line by the degree of corrosion and damage are not the same, different degrees of wear, gate roller, track and other parts by the roller friction, protective layer easily damaged. Thermal spraying metal ladder coating anti-corrosion technology economy, practical, but also to achieve the desired results, it should be vigorously promote the use.