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Corrosion Guide For Immersion Heaters

Notes
Water Demineralized
Water Potable
Water (Sea)
Woods Nickel Strike
Yellow Dichromate
Incoloy (Electropolished)
Quartz or Teflon
Incoloy, Teflon. Quartz or Titanium
Quartz
Quartz or Incoloy
 
 
 
1
1
Zinc Acid
Zinc Ammonium Chloride
Zinc Chloride
Zinc Phosphate
Zinc Plating Acid
Quartz
Titanium or Graphite
Quartz or Teflon
Stainless Steel or Incoloy (Electro-polished)*
Quartz
 
 
 
1.5
1
Zinc Plating Cyanide
Zincate
Zeline (Gas)
Stainless Steel
304 Stainless Steel or Steel
Steel
1
1
 

*Low watt density heaters are recommended.

Acidity and Alkalinity Scale

The degree of acidity or alkalinity of solutions is expressed by the pH value of 7. Water is considered neutral and is given a pH value of 7. Values below 7 are acid, each declining value being 10 times more acid than the previous value. A pH of 6 is 10 times more acid than a pH of 7, and a pH of 3 is 10,000 times more acid that a pH of 7. Solutions having values from 7 to 14 are alkaline by the same multiples of 10. A pH of 14 is 10 million times more alkaline than a pH of 7. Chemical indicators used to indiciate the acidity or alkalinity of solutions are shown in the acidity-alklinity table.

Electropolishing is the process by which the surface of the metal sheathed element is anodically smoothed and homogenized to produce a glossy appearance mitigating the accumulative propensities of many solutions on the sheath itself. Also, resistance to corrosion is somewhat improved.


Because Therm Coil cannot anticipate all conditions under which this information and our products may be used, we cannot be responsible for any electric immersion heater failure that is attributed to corrosion.



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