Need Advice on Valve Cover

[Gary Lewis]

Did a little muriatic around the hole after sand sand sand. Here is the bronze filling the hole. I need to Phos or Muriatic the rest. Not sure this will repair it—rust never sleeps—but will likely rust reform the other areas, then, shooting the primer….

I think you got the hole filled and smoothed off nicely.

[AmericanSavage]

I think you got the hole filled and smoothed off nicely.

Here’s the update after the Muriatic bath, and then neutralized

Also someone mentioned hydrochloric—I only ever use Phosphoric, and more recently have experimented with Muriatic (it’s quicker, but also less forgiving). If not neutralized, it will rust worse than before within 24 hours. But it is way more powerful:

BTW, thanks Gary! Took a couple of tries and playing with the heat!

[ArdWrknTrk]

Here’s the update after the Muriatic bath, and then neutralized

Also someone mentioned hydrochloric—I only ever use Phosphoric, and more recently have experimented with Muriatic (it’s quicker, but also less forgiving). If not neutralized, it will rust worse than before within 24 hours. But it is way more powerful:

BTW, thanks Gary! Took a couple of tries and playing with the heat!

Muriatic IS Hydrochloric.....

Do you ever read the label, so you can understand what kind of dangerous stuff you're dealing with?

[AmericanSavage]

Muriatic IS Hydrochloric.....

Do you ever read the label, so you can understand what kind of dangerous stuff you're dealing with?

Thanks for your concern: you do understand that they call it muriatic because it is not 100% hydro, yes? The stuff is pretty well cut over the counter, to lessen the effect of the more pure/stronger stuff.

Therefore, your assertion they are = to each other is not true.

Here are the facts:

Main Difference – Hydrochloric Acid vs Muriatic Acid

An acid is a chemical compound having characteristic properties such as turning blue litmus red, neutralizing alkali solutions and corrosiveness. Hydrochloric acid is a strong acid compared to other acids. People often confuse Muriatic acid with hydrochloric acid, assuming that both are the same; however, there is a slight difference between hydrochloric acid and Muriatic acid. The main difference between hydrochloric acid and Muriatic acid is that hydrochloric acid is composed of only HCl molecules whereas Muriatic acid is composed of impurities along with HCl molecules.

And yes I do. That is why I have used it as prescribed open and ventilated. You should check out the body shops that use it. It's impressive.

[ArdWrknTrk]

Muriatic IS Hydrochloric.....

Do you ever read the label, so you can understand what kind of dangerous stuff you're dealing with?

Thanks for your concern: you do understand that they call it muriatic because it is not 100% hydro, yes? The stuff is pretty well cut over the counter, to lessen the effect of the more pure/stronger stuff.

Therefore, your assertion they are = to each other is not true.

Here are the facts:

Main Difference – Hydrochloric Acid vs Muriatic Acid

An acid is a chemical compound having characteristic properties such as turning blue litmus red, neutralizing alkali solutions and corrosiveness. Hydrochloric acid is a strong acid compared to other acids. People often confuse Muriatic acid with hydrochloric acid, assuming that both are the same; however, there is a slight difference between hydrochloric acid and Muriatic acid. The main difference between hydrochloric acid and Muriatic acid is that hydrochloric acid is composed of only HCl molecules whereas Muriatic acid is composed of impurities along with HCl molecules.

And yes I do. That is why I have used it as prescribed open and ventilated. You should check out the body shops that use it. It's impressive.

Do you understand that chlorine is a stronger oxidizer than oxygen?

And what about it makes it so toxic and corrosive?

You're trying to remove rust, which was likely caused by sodium chloride.

Another chlorine compound.

And why???

Because chlorine corrosion does not leave a passivated surface..... 💡

Edit;

 

[AmericanSavage]

Do you understand that chlorine is a stronger oxidizer than oxygen?

And what about it makes it so toxic and corrosive?

You're trying to remove rust, which was likely caused by sodium chloride.

Another chlorine compound.

And why???

Because chlorine corrosion does not leave a passivated surface..... 💡

Edit;

https://forum.garysgaragemahal.com/file/n150340/Screenshot_20240327-224800.png

Do you understand the chemical make up of the each is different?—that is why one is called hydro and the other mur. To equate them is false. Even in you own post, demonstrates my point—“also known as” is not the same as “identical.” I have no idea why this is an issue for you. But I posted the fact, of the compound. Whether you choose to accept that is up to you.

As to the why: take it up with the many serious body shops that use it when necessary. They will tell you the why. It is used especially on older 50s panels they are seeking to save. If you seek them out, you will learn the why.

[ArdWrknTrk]

Do you understand that chlorine is a stronger oxidizer than oxygen?

And what about it makes it so toxic and corrosive?

You're trying to remove rust, which was likely caused by sodium chloride.

Another chlorine compound.

And why???

Because chlorine corrosion does not leave a passivated surface..... 💡

Edit;

https://forum.garysgaragemahal.com/file/n150340/Screenshot_20240327-224800.png

Do you understand the chemical make up of the each is different?—that is why one is called hydro and the other mur. To equate them is false. Even in you own post, demonstrates my point—“also known as” is not the same as “identical.” I have no idea why this is an issue for you. But I posted the fact, of the compound. Whether you choose to accept that is up to you.

As to the why: take it up with the many serious body shops that use it when necessary. They will tell you the why. It is used especially on older 50s panels they are seeking to save. If you seek them out, you will learn the why.

Yeah, I'm done

Good luck! 🙂

[AmericanSavage]

Yeah, I'm done

Good luck! 🙂

Thanks for your input.

For those interested in the factual (scientific and widespread) use of the product, here is ONE example. When you get to rust that has been embedded, and maybe even has caused some serious pitting, Muriatic is the only option. Great guy.

[viven44]

Yeah, I'm done

Good luck! 🙂

Thanks for your input.

For those interested in the factual (scientific and widespread) use of the product, here is ONE example. When you get to rust that has been embedded, and maybe even has caused some serious pitting, Muriatic is the only option. Great guy.

Thanks for the share.

A good portion of my job involves corrosion prevention in PCBs and substrates used in semiconductors. Over there you deal with Copper, Aluminum, not steel, but the principles are similar.

HCL, often in combination with H2O2 is typically used to etch metal.

If metal oxides only are to be removed then, other acids like H2SO4, H3PO4, but of course generally we don't deal with pitting etc in copper traces, if there is any pitting at all, the trace is too narrow to still be usable.

I can see your approach working well here using muriatic, it will definitely do the best job of etching it and with a good job of neutralize it and rinsing it to remove all resides, and then passivating it with paint, I can see it working well.

About Chlorine, in semiconductors we avoid residues of it like the plague, as it is by far the worst catalyst for long-term corrosion even in ppm levels (galvanic or electrochemical or just environmental corrosion which is most applicable for automobiles). Again, with a good rinse (ideally with deionized water like it is done in PCB/substrate manufacturing because it is more likely to attract any ions) I can see it working well especially on something that will be painted well.

I wanted to suggest another approach I found recently which involves media blasting to remove all pitting. In your case that would be wonderful as you are only trying to cover a very small area. After that you can simply finish it off with paint and be done.

I recently tried that in my post below

https://forum.garysgaragemahal.com/460-swap-into-a-78-Bronco-tp148376p149892.html

[AmericanSavage]

Thanks for the share.

A good portion of my job involves corrosion prevention in PCBs and substrates used in semiconductors. Over there you deal with Copper, Aluminum, not steel, but the principles are similar.

HCL, often in combination with H2O2 is typically used to etch metal.

If metal oxides only are to be removed then, other acids like H2SO4, H3PO4, but of course generally we don't deal with pitting etc in copper traces, if there is any pitting at all, the trace is too narrow to still be usable.

I can see your approach working well here using muriatic, it will definitely do the best job of etching it and with a good job of neutralize it and rinsing it to remove all resides, and then passivating it with paint, I can see it working well.

About Chlorine, in semiconductors we avoid residues of it like the plague, as it is by far the worst catalyst for long-term corrosion even in ppm levels (galvanic or electrochemical or just environmental corrosion which is most applicable for automobiles). Again, with a good rinse (ideally with deionized water like it is done in PCB/substrate manufacturing because it is more likely to attract any ions) I can see it working well especially on something that will be painted well.

I wanted to suggest another approach I found recently which involves media blasting to remove all pitting. In your case that would be wonderful as you are only trying to cover a very small area. After that you can simply finish it off with paint and be done.

I recently tried that in my post below

https://forum.garysgaragemahal.com/460-swap-into-a-78-Bronco-tp148376p149892.html

This is EXCELLENT viven44. I learned something i did not know from it. I will be checking out your link. Cheers!

Read your link: Ospho is fabulous, and I certainly have used it. It can be used after Muriatic on difficult jobs, and that is beneficial. Generally speaking it works great on rusty sheet metal, and it does need to be neutralized as some paints do not like it. Certainly the gooey stuff it sometimes creates, needs cleaning. I thought you did a great job on that cab floor.