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You are here : Mechanical seal type of corrosion protection methods
The corrosion damage to mechanical seal technology include: Chain corrosion, corrosion of non-metallic ring, the auxiliary ring and the contact area of corrosion. Mechanical seal for corrosion damage, the main protection methods are scientific selection, structural design, maintenance and use aspects.
The case of damaged mechanical seals are more common forms of damage are corrosion damage, heat damage and mechanical damage. Corrosion damage to the dangers of a larger one, due to the special mechanical seal structure and the working environment and conditions are different, the morphology of a variety of corrosion damage.
l corrosion of the mechanical seal
1.1 Corrosion of metal ring
First, the surface corrosion.
If corrosive metal ring surface contact, while the corrosion of the metal itself is intolerant, it will have surface corrosion, the phenomenon is leaking, early wear, damage, sound and so on. Corrosion of metal surfaces have two forms of film and no film, no film of metal corrosion is dangerous, the corrosion process to a certain speed, mainly selection error. Film of corrosion, the passive film properties usually have a protective effect, but the metal seal ring used in materials such as stainless steel, cobalt, chromium alloy passive film on its surface friction in the face of destruction, the new under hypoxia membrane is difficult to generate, so that galvanic corrosion worse.
Second, the stress corrosion cracking.
Corrosion and metal under tensile stress at the same time, the first cracks in the weak areas and then to develop in depth, resulting in rupture, known as stress corrosion cracking, the choice of surfacing and iron carbide, tungsten carbide, titanium carbide seal ring, prone to stress corrosion cracking. Radial seal ring cracks are generally divergent, and may be one or more. These cracks of the entire seal face communication and accelerate the end of the wear and tear, an increase of leakage.
1.2 Corrosion of metallic ring
First, the graphite ring corrosion.
Resin impregnated graphite ring impermeable, and its corrosion of three reasons: First, when the end overheat, the temperature higher than 180 ¡æ, the resin impregnated graphite to break away from the ring, the ring wear down; the second is impregnated If the inappropriate choice of resin will undergo chemical changes in the media, but also to wear down; third is impregnated deep enough, when rubbed impregnated layer, wear down. Therefore, the establishment of closed cooling system, choose the corrosion resistance of the impregnated resin, using high-pressure impregnation, immersion depth increase is necessary.
Second, the oxidation of graphite rings.
In the oxidation of medium, end bad in the dry friction or cooling, the resulting temperature of 350 ~ 400 ¡æ graphite ring can react with oxygen to produce CO, gas, can become rough face, or even rupture. Non-metallic ring in the chemicals and under the same stress will rupture.
Third, the PTFE (F4) seal ring of corrosion.
F4 filling such as fiberglass, graphite, metal powder to improve its temperature resistance, wear resistance. F4 fill the corrosion ring is filled mainly selective etching, stripping or deterioration damage. For example, hydrofluoric acid, hot corrosion of glass fiber elements, so what things should be filled, as the case may be,
The case of damaged mechanical seals are more common forms of damage are corrosion damage, heat damage and mechanical damage. Corrosion damage to the dangers of a larger one, due to the special mechanical seal structure and the working environment and conditions are different, the morphology of a variety of corrosion damage.
l corrosion of the mechanical seal
1.1 Corrosion of metal ring
First, the surface corrosion.
If corrosive metal ring surface contact, while the corrosion of the metal itself is intolerant, it will have surface corrosion, the phenomenon is leaking, early wear, damage, sound and so on. Corrosion of metal surfaces have two forms of film and no film, no film of metal corrosion is dangerous, the corrosion process to a certain speed, mainly selection error. Film of corrosion, the passive film properties usually have a protective effect, but the metal seal ring used in materials such as stainless steel, cobalt, chromium alloy passive film on its surface friction in the face of destruction, the new under hypoxia membrane is difficult to generate, so that galvanic corrosion worse.
Second, the stress corrosion cracking.
Corrosion and metal under tensile stress at the same time, the first cracks in the weak areas and then to develop in depth, resulting in rupture, known as stress corrosion cracking, the choice of surfacing and iron carbide, tungsten carbide, titanium carbide seal ring, prone to stress corrosion cracking. Radial seal ring cracks are generally divergent, and may be one or more. These cracks of the entire seal face communication and accelerate the end of the wear and tear, an increase of leakage.
1.2 Corrosion of metallic ring
First, the graphite ring corrosion.
Resin impregnated graphite ring impermeable, and its corrosion of three reasons: First, when the end overheat, the temperature higher than 180 ¡æ, the resin impregnated graphite to break away from the ring, the ring wear down; the second is impregnated If the inappropriate choice of resin will undergo chemical changes in the media, but also to wear down; third is impregnated deep enough, when rubbed impregnated layer, wear down. Therefore, the establishment of closed cooling system, choose the corrosion resistance of the impregnated resin, using high-pressure impregnation, immersion depth increase is necessary.
Second, the oxidation of graphite rings.
In the oxidation of medium, end bad in the dry friction or cooling, the resulting temperature of 350 ~ 400 ¡æ graphite ring can react with oxygen to produce CO, gas, can become rough face, or even rupture. Non-metallic ring in the chemicals and under the same stress will rupture.
Third, the PTFE (F4) seal ring of corrosion.
F4 filling such as fiberglass, graphite, metal powder to improve its temperature resistance, wear resistance. F4 fill the corrosion ring is filled mainly selective etching, stripping or deterioration damage. For example, hydrofluoric acid, hot corrosion of glass fiber elements, so what things should be filled, as the case may be,
