The authoritative public forum
  for Metal Finishing 1989-2024
  

  -----

Molecular weight and equivalent weight of the following magnesium alloys

Could some one tell me the molecular weight and equivalent weight of the following magnesium alloys. AZ91D AM60

Bharath Rajagopalan
University of Michigan - Dearborn Heights, Michigan
2003

---

I've only vaguely heard of such a concept as molecular weight and equivalent weight for alloys, in the context of Faraday's Law for deposition of alloy plating. Someone enlighten me.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

---

The concept of molecular weight doesn't apply to alloys and to use the term can be misleading. As far as calculating the equivalent weight, all you do is take the percentage composition of each metal in the alloy, multiply that by the equivalent weight of the individual metal and add them all up. This of course assumes 100% efficiency if you are talking about electrochemical reactions! You can, therefore factor in any efficiency levels.

Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2003

---

2005

How can you calculate the Eq wt of an element. the equivalent wt depends on the valacy of the element in a compound...

For example if I have Fe=93.50%,C-0.25%,Ni-0.25% and Cr=6%
then how I can calculate the Eq wt of the alloy.

thanx

Suresh Divi
- Reno, Nevada, USA

---

Hi Suresh. Mr. Crichton explained this pretty well, and your question implies that you understood his explanation. The valence to which these materials will dissolve may vary, though, rendering the question unanswerable as an abstract. As usual, the question comes up of what is the context? What is the situation you find yourself in that knowing the equivalent weight of the alloy would be useful? The real world question may be answerable despite the non answerability of the abstract.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2005