1. The metal ring is corroded by 1, and the surface is uniformly corroded. If the surface of the metal ring is in contact with the corrosive medium, and the metal itself is not resistant to corrosion, surface corrosion occurs, which is leakage, early wear, damage, sound, and the like. Common damage and protective measures in the use of BRY diesel engine heat transfer oil pump mechanical seal 1. Metal ring corrosion 1, uniform surface corrosion. If the surface of the metal ring is in contact with the corrosive medium, and the metal itself is not resistant to corrosion, surface corrosion occurs, which is leakage, early wear, damage, sound, and the like. The metal surface is uniformly corroded in both film-forming and film-free forms. The metal-free corrosion of the film is dangerous, and the corrosion process is carried out at a certain speed, which is mainly caused by the material selection error. The film is corroded, and its passivation film usually has a protective property, but the material used for the metal sealing ring, such as stainless steel "target=_blank> stainless steel, cobalt, chrome alloy, etc., the surface of the passivation film is destroyed in the end face friction, Under the condition of anoxic conditions, Botaibang is difficult to generate new membranes, which makes galvanic corrosion worse.
2, stress corrosion cracking. Under the action of corrosion and tensile stress, the metal firstly cracks in the weak area, and then develops into the depth, causing cracking, called stress corrosion cracking. The BRY diesel heat transfer oil pump is made of hardfacing alloy and cast iron, tungsten carbide and titanium carbide. Such as the sealing ring, it is prone to stress corrosion cracking. The seal ring cracks are generally radially divergent and may be one or more. These cracks communicate the entire sealing end face, accelerating the wear of the end face and increasing the amount of leakage.
2. Non-metallic ring corrosion 1. Graphite ring corrosion. Impervious graphite ring impregnated with resin, its corrosion has three reasons: First, when the end face is overheated, when the temperature is greater than 180oC, the impregnated resin should be folded away from the graphite ring to reduce the wear resistance of the ring; If it is not properly selected, chemical changes will occur in the medium. The BRY diesel engine heat transfer oil pump also reduces the wear resistance. Third, the resin impregnation depth is not enough. When the impregnation layer is removed, the wear resistance decreases. Therefore, the establishment of the sealed cooling system, the choice of corrosion-resistant impregnating resin, the use of high-pressure impregnation, it is necessary to increase the impregnation depth. Botou Taibang Pump & Valve Manufacturing Co., Ltd. 2, oxidation of graphite rings. BRY diesel engine heat transfer oil pump in the oxidizing medium, when the end face is dry friction or poor cooling, the temperature of 350 ~ 40o °C can make the graphite ring react with oxygen to produce CO, gas, which can make the end face rough or even crack. Non-metallic rings also rupture under the action of chemical medium and stress.
3, corrosion of PTFE (tetrafluoroethylene gasket) sealing ring. Corrosion filling the F4 ring mainly refers to selective corrosion, dissolution or deterioration of the filling. For example, in hydrofluoric acid, glass fiber molecules are thermally corroded, so what should be filled depends on the specific situation.
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