Salt deposit deterrance by Magnesium rod

Click For Summary
SUMMARY

The discussion centers on the use of magnesium rods in domestic water heaters to deter salt deposition on heating elements. It is established that magnesium acts as a sacrificial anode, which may influence the chemical dynamics of hard water deposits primarily composed of magnesium and calcium compounds. The oxidation of the magnesium rod potentially provides alternative sites for crystal formation, thereby reducing the buildup on the heating element. However, there is a counterargument that using magnesium could inadvertently increase water hardness and mineral deposits.

PREREQUISITES
  • Understanding of sacrificial anodes in corrosion prevention
  • Knowledge of hard water chemistry, specifically magnesium and calcium compounds
  • Familiarity with domestic water heater components and their functions
  • Basic principles of oxidation and crystallization processes
NEXT STEPS
  • Research the role of sacrificial anodes in corrosion prevention in water heaters
  • Study the chemical properties of hard water and its effects on heating elements
  • Explore alternative methods for reducing mineral deposits in water systems
  • Investigate the impact of magnesium rods on water hardness and overall water quality
USEFUL FOR

Homeowners, plumbing professionals, and maintenance technicians interested in improving the efficiency and longevity of domestic water heating systems.

NSK8700
Messages
19
Reaction score
0
I recently repaired a domestic water heater and had to replace the heater element that was heavily coated with hard water salts as well as the SS (Stainless Steel) tank had a large quantity of salt precipitate; the heater element has the option to have a magnesium rod/ element placed/ coupled with the heating elements.It is said it will deter salt deposition on the heating element. I wish someone could explain me the chemical dynamics of this.
 
Chemistry news on Phys.org
Hard water deposits are mainly magnesium and calcium compounds. I'm guessing the surface of the Mg rod oxidizes and serves to provide seed crystals somewhere other than the heating element.

If it were serving as a sacrificial anode, it would actually increase the hardness of the water (and the amount of mineral deposits).
 

Similar threads

Replies
12
Views
6K
  • · Replies 19 ·
Replies
19
Views
9K
  • · Replies 12 ·
Replies
12
Views
3K