Cast iron pneumatic - valve corrosion and anticorrosion measures pneumatic

corrosion mechanism of cast iron cast iron pneumatic valve usually for chemical or electrochemical corrosion, the corrosion status can be evenly and partial, stress and grain boundary. Corrosion engineering requirements should be uniform, because local, stress and grain boundary corrosion is dangerous form of destruction. Cast iron and its chemical composition, microstructure and corrosion factors, such as on the surface properties of parts also and erosion medium composition, lively and temperature and other factors. Cast iron in atmospheric corrosion speed is slow, with the extension of time, the casting surface will form a layer of protective film, make the alloy by lively state into a state of inertia, significantly reduce corrosion of cast iron in the atmosphere. In alloy cast iron have obvious boundary, due to the special precipitate along grain boundary carbides and other compounds, solid solution containing alloying elements to reduce, micro intergranular corrosion along the grain boundary easily happened, make cast iron to produce holes or lower strength. So the rubber processing cutting tool rake Angle and back Angle than the processing of metal cutting tool rake Angle and back Angle ( Figure. Elected WCrV tool materials. Must be cleared of rubber crumb, otherwise affect surface roughness. According to the theory of electrochemical corrosion, the ideal organization should be a single and homogeneous microstructure, and pure iron, ferrite and austenite steel, other conditions being the same, has higher corrosion resistance stability. But forecasts for a single microstructure of cast iron is impossible, only consider microstructure uniformity to improve corrosion resistance ability. Some information, cast iron in general weak medium than ordinary grey cast iron has higher corrosion resistance. In room temperature, sulphuric acid, iron stability and low alloy cast iron is the same. Stability in the % ~ % of acetic acid is higher than low nickel alloy cast iron. To some extent, can be used as a substitute of low alloy cast iron. Cast iron pneumatic valve anti-corrosion measures to improve the ability of cast iron seawater corrosion, a better approach is to choose meehanite ( Table with proper alloying to solve. Such as HTNi ( The microstructure of tables is pearlite & gt; % % %, fine flake, ~ for flake graphite, length ~ microns, binary phosphorus eutectic & lt; % for single pearlite, grain boundary carbide precipitation, effectively avoid the grain boundary corrosion, according to the provisions of GB, N grade of grey cast iron, its tensile strength for N - ( N +, actual tensile strength for ~ between MPa, its pressure resistance can guarantee completely. Another hot after inoculation, matrix was evenly, not only internal stress significantly reduced at the same time, can avoid stress corrosion. Must emphasize the content of nickel and chromium and nickel in graphitization coefficient of the eutectic temperature is +, the graphitization coefficient of chromium - , so as to prevent grain boundary carbide precipitation, Ni, Cr & gt; : and allowance shall be maintained to eliminate the effect of Mn to form carbide. Practice has proved the % in gray cast iron containing Cr, it forms a large number of carbide, and cutting is difficult, so the Cr content is not the more the better.
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