Dia 19mm Magnesium bar anode for water heater , extruded AZ31
magnesium alloy anode rod
The rod is screwed into the top of your water heater and protects
your water heater from rusting.
When the tank is filled with water the anode rod sacrifices itself
to protect the exposed steel of the water heater, through a method
called electrolysis. Electrolysis happens when there are two pieces
of metal connected inside of water, the process makes the anode rod
corrode in place of the exposed steel in your water heater. During
this process the more noble (less reactive) metal will corrode over
the less (more reactive) noble metal. Aluminum, magnesium, and zinc
are all much less noble than steel, meaning they will corrode
before the steel, which is why they are used for anode rods.
When the potential polarity is reversed, it becomes a cathode,
which will accelerate the corrosion of steel. Secondly, the zinc
alloy anode will undergo intergranular corrosion in
high-temperature water, causing the crystal grains to fall off
directly without generating a protective current, resulting in a
decrease in current efficiency. Aluminum-based alloy sacrificial
anodes are generally used in seawater media, and are rarely used in
fresh water, especially in water heaters. The United States has
developed 8020 and K804 aluminum alloy sacrificial anodes used in
fresh water, but has not been widely promoted and applied. At the
same time, it has been found in medicine that the accumulation of
aluminum in the brain is related to Alzheimer's disease. Therefore,
the aluminum sacrifice of this alloy Anodes are rarely used in
water heaters. 1.2 The sacrificial anode materials commonly used
abroad for volumetric water heaters are AZ63 and AZ31 series of
magnesium alloys with ultra-low impurity content in the ASTM
B843-93 standard. Their typical chemical composition is AZ63:
A1 5.3%～6.7%, Zn 2.5%～ 3.5%, Mn 0.15%min point 0.6%, Fe 0.003%max,
Cu 0.02%max, Ni 0.001%max, Si 0.1%max, AZ31: A12.5%～3.5%,
Zn 0.7%～1.3%, Mn 0.2 %Min, Fe 0.002%max, Cu 0.015max, Ni 0.001%max,
Si 0.1%max. The above alloy has an open circuit potential of -1.55V
to -1.65V and a current efficiency of 53.3 to 60% in hot water of
20 to 80.
Regular sizes:
| NPT | Length |
| 1/2” | 6” |
| 3/8” | 2” |
| 3/4” | 7” |
| 3/8” | 3” |
| 3/8” | 1-1/2” |
| 3/8” | 1-5/8” |
| 1/4” | 2-1/2” |
| 1/4” | 3” |
| 1/4” | 1-3/4” |
| NPT | Length |
| 1/2” | 6” |
| 3/4” | 7” |
| 3/8” | 2” |
| 3/8” | 3” |
| 3/8” | 1-1/2” |
| 3/8” | 1-5/8” |
| 1/4” | 2-1/2” |
| 1/4” | 3” |
| 1/4” | 1-3/4” |
Can be also customized by buyer
Contact me for more details:
Vivian Jiang
International Marketing & Sales Manager
Email: vivian@hbnewmaterial.com , metal@vip.163.com
Tel: +86-731-85717705
Fax: +86-731-85716569
Mobile/whatsapp: +86-139-7488-3816
Skype: vivian.jjy
