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The corrosion resistance of the austenitic stainless steels (within the concentration and temperature conditions described above) relies on the formation and stability of a passive film. With increased temperature or for concentrations between 10% and 85%, the standard 300 series stainless steels do not develop a passive film, and are considered active, therefore high corrosion rates will occur. The effect of flow velocity is dependent on the stability of the passive film. Under stable passive film conditions, velocities up to 20 ft/sec (6 m/sec) are possible. However, within the trans-passive region, where the passive film becomes unstable, high velocity may remove the protective film, and result in increased corrosion rates. Aerated conditions or the presence of oxidizing agents assist in stabilizing the passive film. However, excessive amounts of oxidizing agents may create trans-passive conditions where corrosion rates again increase. Under borderline conditions, anodic protection can be used to maintain the stainless steel in the passive region and increase the useful temperature and concentration range.
Equilibrium of body - force acted at any angle: Magnitude of force ' p ' which is required to move the body down the plane. When ' p ' is acted with an angle of φ.
a) A pair of 20 degree full depth involute spur gears having 30 and 50 teeth respectively of module 4mm are in mesh. The smaller gear rotates at 1000 rpm. Determine- 1) Contact
what is resultant of coplanar non concurrent forces
(a) Show that the force exerted by a jet of water on an inclined fixed plate in the dissection of jet is given by fx = .a.v 2 . sin 2 θ. Where a is area of jet, v is velocity of j
General Resource Models In computer controlled scheduling, material, machine handling equipment, tooling and buffer space should be comprised. The explicit consid
Describe the Elements of Polyhedral objects Objects that are often encountered in engineering applications can be classified as either polyhedral or curved objects. A polyhedr
Find out the velocity of the system: Blocks A and B of mass 20 kg and 45 kg, respectively are associated by a weightless rope over a frictionless pulley as shown in Figure a).
Distribution of shearing stresses on l--sections and miscellaneous sections
Calculate the Net Positive Suction Head A pump station has been designed to lift water out of a 6 metre deep pit (vented to atmosphere) via a centrifugal pump mounted at groun
Q. Flange Assembly with Torque Measurement? Select the proper bolts and gasket for the intended service. Use only new, undamaged gaskets. Lubricate the bolt threads and nut
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