[DeTomaso] alum heads on the street

[dyogi at hawaii.rr.com]

The manufacturer of No-Rosion is a chemist.  Their products were developed by his father, also a chemist.  I would tend to believe his explanation which is backed by generations of research used to create his products.  In regards to annodes, they pretty much provide more localized protection.  No Rosion products contain molybdate which serves the similar purpose.  This is from the No Rosion website FAQ page:

"A.  Electrolysis occurs when a very small electrical current passes between metals having different electronegativities, such as iron and aluminum.  Various contaminants in coolant allow it to function as an electrolyte solution, causing the more electronegative metal (aluminum) to gradually be dissolved.  No-Rosion contains a premium ingredient called “molybdate,” a form of the semi-precious metal “molybdenum.”   Via a process known as “electrocrystallization,” molybdate forms a molecular-thick film on the surface of aluminum that inhibits the transfer of electrons, thus almost completely preventing damage from electrolysis"

Q.  Is this more effective than using a sacrifical anode, such as zinc or magnesium?

A.  Yes.  While sacrificial anodes may provide some localized protection within close vicinity of the anode, the protection does not reach all remote areas of the system, whereas the molybdate in No-Rosion provides complete protection to the entire system.  

Aloha,

Dennis