Why Spillway Gates Don't Rust Out

❤ fantastic! Love your content and streamlined professionalism

I'm living on a boat in the tropics. Any advice for preventing corrosion inside a laptop?

I saw the title of this video earlier today, while scoring through vids on my phone, and initially read "Catholic Protection".

I see uneven drying in the video...

The reason the American analog telephone network designed in 1934 used -48 volts, meaning a positive ground. This was to protect the underground steel conduits.

This is awesome, thanks for showcasing the process!

Thank you. I teach about hydraulic elevators. This is a topic I didn’t know much about….now I do. You’ll make me sound smart!

You also could use electricity to speed up the corrosion.

" 28.35 grams of prevention is worth 453.6 grams of cure " in metric. 😉

So just apply a healthy caesium-coating to my steel and I should be good to go, right?

How far apart are anodes typically spaced on small boats?

I lived in the area for 25ish years and I've never seen the Howard Franklin from that angle wow. Thank you

Wow I just happened across this video while preparing to attempt to get my NACE Cathodic Protection 1 certification and it is a great low level introductory primer. Excellent content, thanks!

Surprised not to see any mention of the place most homes contain a cathodic protection system. Tank type water heaters. (I don't know if tankless water heaters have anything similar).

Thank goodness I still live in a world of telephones, car batteries, handguns and many things made of zinc!

Glad this got recommended. Ive been wanting to know about this for a while

Very useful. Why isn't this approach widely used on cars?

Isn’t anode the hight electric potential and cathode the low potential?

Hey Grady, I have a little more info for you about the Howard Frankland bridge. My dad lived in Tampa when it was being constructed. One of the causes of the corrosion was that the contractor, Copher Brothers Construction, used salt water when mixing the concrete. It was a big scandal at the time according to my dad.

The untreated steel looks like it got hit by some Warhammer Fantasy Chaos. :P

Wow

@Practical Engineering: If a timelapse doesn't contain info about the time, that's a lapse.

Interesting stuff, thank you.

I keep coming back to this video for that intro music alone. Any idea what it is? I can't find it for the life of me.

Hi Grady. Great video about Cathodic Protection. You explained it very well. I did cathodic protection for 5 years for pipelines and tanks when I worked for Matcor. What I learned in 5 years you were able to compress to 13 min. When at Matcor I was the only drafter so I was a part of every project, did thousands of junction boxes and anodes. I know the life span of the anodes we installed was 100 years, and that monitoring the system is key in maintaining Cathodic Protection. Also sand is what we mostly used to carry the electric current.

We had a big open double aluminium gate on our home garage. Once someone tried to pick the lock. My father bought the biggest chain I ever saw and put that on it. The chain was made of iron. The contact of aluminium and iron made the chain rust on the contact points, just in the contact points. I knew it was because a difference of potential was happening there, but never gave a second thought. Some time later I was waiting the bus in front of a big cemetery in my city and the beautiful old style lance iron rods of the fence around the cemetery one had a box written "cathodic protection". I went to search for it and then I was confused. It was the reverse phenomena: the chain was acting as the sacrificial electrode. But how? Shouldn't aluminium protect the iron like zinc does in ships? The aluminium gate was untouched.

Neat

Pretty sure the Pope banned the Cathodic use of protection....

Reminded me of sailboats using sacrificial zinc pieces...

oh would have been nice if one sample would be coupled with copper

Awhhhh i hoped you would have done a weight difference on the steel plates before and after the test. Still an awesome video tho!

it was nice seeing a timelapse of the corrosion especialy the water

this is like magic to me

I just learned about this in chemistry class!

Parabéns, muito bem explicado.

I have a question , I am thinking of using metal insulated panels as skirting around the house. These panels are interlocking, but now I'm worried about moisture and rust. Is it a bad idea?

thank you , really great video

Watching this after taking a break from hydrovacing CP test stations. I understand it better now thanks to this

I want the Rustomatic 3000, I really really do.

Can you do a video on the 7 Mile Bridge? I drove over it last year and it was CRAZY. Absolutely massive two lane bridge that goes over miles of ocean. I know it's relatively shallow around there with all the islands, but it's still an amazing feat. There's also the old bridge next to it that has some train tracks on it, but it's in disrepair.

Worthy of 1,000 likes and I would if I could

So I guess we shouldn't remove that ugly, corroded block of metal attached to our aluminum boat...

Wow ads in the ads!

Ask the Hydraulic Press Channel to test the samples for strength

Actually made a miniature impressed cathodic current protection thingy (not exactly but i was using the same theory just adjusted to a smaller scale) for y12 chemistry was really fun watching one of the steel samples rust away and the other as if i just bought it.

An alternative to actual cathodes is the application of zinc rich primers. I had test panels that were exposed to the harsh South Florida environment on a test fence for eight years. They were steel panels that were coated with various primers I had formulated. Each panel had a deep x scratched into the surface. A duplicate set were subjected to testing in the salt spray testing chamber. Some of the formulations left outside had very little surface rust from intrusion and almost no penetration. The panels in the salt spray chamber did not fare as well but there were still very good results for some of the coatings. It finally came down to the amount of money the client was willing to spend.

As a diesel mechanic, zinc galvanizing works pretty well, but steel and aluminum hate eachother. They corrode together and destroy eachother.

Dam! Nice shirt!