Originally Posted By: Andy636
Originally Posted By: dlayman
Originally Posted By: Andy636
Originally Posted By: dlayman
Source of this corrosion info? The chloride ion is the attacking part of the Nacl molecule. Iron and steel are susceptible to corrosion from halides, of which chloride is an example, in general. Sodium or calcium being the counter cation should make no difference, they can both be correctly referred to as chloride salts.. Sand is not corrosive to metal, however it may cause paint damage, exposing the metal to the salt of other environmental factors.
Forgot to mention one aspect; they use corrosion inhibited CaCl2.
I never said that sand is corrosive, but the test I've read compared the CaCl2 effect on steel, Al and Al-Mg with the sandblasting and corrosion effect at elevated speeds of the sand-salt mixture and it came about 80 times less.
I could go dig the links if you wish, but they are in Romanian
Interesting. I wonder how they make it corrosion-inhibited. pH adjustment might have an effect, though probably not enough. I wonder if the mixture includes an amount of a sacrificial metal for the chloride to attack, rather than the iron and other metals of the vehicle.
We don't get sand here - we get even worse. Tiny gravel and stone chips ("cinders") which absolutely beat the tar out of the front of your car, letting it nice and exposed to the corrosive salt.
Don't know the exact formulation but the used substance also has manganese chloride, calcium hydroxide, and anhydride.
I know close to nothing about chemistry so I can't tell what's what...LOL...sorry...no Walter White here.
The hydroxide would keep the pH alkaline, possibly inhibiting corrosion. And the manganese is probably there as the sacrificial metal as it has several oxidative states (rust is basically oxidation of iron). Anhydride is basically a descriptor term, meaning without water - not sure what its referring too, there might be something missing from your list of ingredients. Thanks for the info, though, there's enough there for it to make sense to me (chemistry background). I can see why this would be much more expensive than simple sodium or calcium chloride, it likely needs to be mixed pretty exactly for it to work well.
Originally Posted By: dlayman
Originally Posted By: Andy636
Originally Posted By: dlayman
Source of this corrosion info? The chloride ion is the attacking part of the Nacl molecule. Iron and steel are susceptible to corrosion from halides, of which chloride is an example, in general. Sodium or calcium being the counter cation should make no difference, they can both be correctly referred to as chloride salts.. Sand is not corrosive to metal, however it may cause paint damage, exposing the metal to the salt of other environmental factors.
Forgot to mention one aspect; they use corrosion inhibited CaCl2.
I never said that sand is corrosive, but the test I've read compared the CaCl2 effect on steel, Al and Al-Mg with the sandblasting and corrosion effect at elevated speeds of the sand-salt mixture and it came about 80 times less.
I could go dig the links if you wish, but they are in Romanian
Interesting. I wonder how they make it corrosion-inhibited. pH adjustment might have an effect, though probably not enough. I wonder if the mixture includes an amount of a sacrificial metal for the chloride to attack, rather than the iron and other metals of the vehicle.
We don't get sand here - we get even worse. Tiny gravel and stone chips ("cinders") which absolutely beat the tar out of the front of your car, letting it nice and exposed to the corrosive salt.
Don't know the exact formulation but the used substance also has manganese chloride, calcium hydroxide, and anhydride.
I know close to nothing about chemistry so I can't tell what's what...LOL...sorry...no Walter White here.
The hydroxide would keep the pH alkaline, possibly inhibiting corrosion. And the manganese is probably there as the sacrificial metal as it has several oxidative states (rust is basically oxidation of iron). Anhydride is basically a descriptor term, meaning without water - not sure what its referring too, there might be something missing from your list of ingredients. Thanks for the info, though, there's enough there for it to make sense to me (chemistry background). I can see why this would be much more expensive than simple sodium or calcium chloride, it likely needs to be mixed pretty exactly for it to work well.