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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.
state a note on reversible and irreversible process?
can the superheat be in percentage?
What is a newton ring excrement
in the torsion equation the term j/r is called
Q. Functional areas of geometric modeling? Drafting • Automatic planar cross-sectioning. • Automatic hidden lines and surface removal. • Automatic production of s
no passing rule definition
Helium Helium (He) is an inert, very light monoatomic gas, of atomic weight of 4. It is obtained by separation from natural gas. Helium is refined to a purity of min. 99.99
Ratio of applied stress: What should be the ratio of applied stress, s, to yield stress s Y in a large thin plate so that plastic spread along lint of crack is equal to 1 /1
velocity acceleration by relative method and intentan methodto be showed graphical on it?
A multiple disc clutch, steel on bronze, is to transmit 4.5 kW at 750 r.p.m. The inner radius of contact is 40mm and outer radius of the contact is 70 mm. The clutch operates in oi
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