਍ഀ ਍ഀ ਍ഀ ਍ഀ Effect of temperature on the Chemistry of Corrosion and Corrosion rates਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ ਍ഀ
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Effect of Temperature on Corrosion

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਍ഀ                                                ਍ഀ The effect of Temperature on Corrosion
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਍ഀ In general, corrosion rates increase ਍ഀ with increasing temperature. In seawater, this increase is much less than the ਍ഀ doubling of reaction rates with each 18°F rise in temperature that would be ਍ഀ expected if the reactions were under diffusion control as are many other ਍ഀ chemical reactions.
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਍ഀ For many materials, such as steels, where the oxygen content of the water ਍ഀ directly affects the corrosion rate, the effect of temperature is minimal as in ਍ഀ situations where the corrosion rate would be increased by increased temperature, ਍ഀ the solubility of oxygen is decreased with increasing temperatures and the two ਍ഀ effects counteract each other. Steels and਍ഀ copper ਍ഀ alloys are particularly insensitive to temperature effects in normal marine ਍ഀ immersion.਍ഀ
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਍ഀ For other alloys that depend on a passive film for their corrosion resistance, ਍ഀ the effects of temperature can be more pronounced.਍ഀ
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਍ഀ At elevated temperatures the solubility oxygen required for repairing protective ਍ഀ oxide films found on many passive materials is reduced and the reactions that ਍ഀ cause the films to break down are enhanced by the increased temperatures.਍ഀ
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਍ഀ Many stainless steels have what is essentially a “critical ਍ഀ pitting temperature” in seawater that is in the range of temperatures ਍ഀ experienced in natural seawater. In cold waters they do not pit but in warmer ਍ഀ waters they are susceptible.
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਍ഀ Source: "Corrosion Control" NAVFAC MO-307 september 1992
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਍ഀ  ਍ഀ ਍ഀ Effect of Temperature on Corrosion in Seawater
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਍ഀ For most chemical reactions, the reaction rate increases with increasing ਍ഀ temperature. Temperature affects the corrosion rate of metals in electrolytes ਍ഀ primari through its effect on factors which control the diffusion rate of ਍ഀ oxygen.਍ഀ
਍ഀ The corrosion of iron and steel is an example of this because temperature ਍ഀ affects the corrosion rate by virtue of its effect on the oxygen solubility and ਍ഀ oxygen diffusion coefficient.਍ഀ
਍ഀ As temperature increases the diffusion coefficient of oxygen also increases ਍ഀ which tends to increase the corrosion rate.਍ഀ
਍ഀ However as temperature is increased oxygen solubility in aqueous solutions ਍ഀ decreases until at the boiling point all oxygen is removed; this figtor tends to ਍ഀ decrease the corrosion rate.਍ഀ
਍ഀ The net affect fo mild steel, is that the corrosion rate approximately doubles ਍ഀ for a temperature rise of 30°C up to a maximum temperature at about 80°C, the ਍ഀ rate then falls off in an open system because the decreall in oxyben solubility ਍ഀ becomes the most important factor.਍ഀ
਍ഀ In a closed system, where oxygen cannot escape the corrosion rate continues to ਍ഀ increase indefinitely with temperature until all the oxygen is consumed.
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਍ഀ source:
THE EFFECT OF ENVIRONMENT ON THE CORROSION OF METALS IN SEA ਍ഀ WATER- -A LITEATURE SURVEY
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਍ഀ  ਍ഀ Useful documents:਍ഀ  
਍ഀ  ਍ഀ The Effect of ਍ഀ Temperature and Acid Concentration on Corrosion of Low Carbon Steel in ਍ഀ Hydrochloric Acid Media਍ഀ  
਍ഀ  ਍ഀ ਍ഀ ਍ഀ The effect of temperature on Corrosion Control਍ഀ  
਍ഀ  ਍ഀ ਍ഀ ਍ഀ THE EFFECT OF ENVIRONMENT ON THE CORROSION OF METALS IN SEA WATER- -A LITEATURE ਍ഀ SURVEY ਍ഀ  
਍ഀ  ਍ഀ ਍ഀ Temperature Effects on Iron Corrosion਍ഀ  
਍ഀ  ਍ഀ ਍ഀ The Importance of Temperature In Assessing Iron Pipe Corrosion in Water ਍ഀ Distribution Systems਍ഀ  
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