Muratic acid

[billnpat]

After scraping, brushing, wet sanding, and an acetone wash.....i find that a finish
application of Muratic acid followed by a hose down makes those brass props gleam,
not sure about the other props......

 

[RollerCoastr]

That would make me nervous. I always neutralize acid after using it.

 

[scoflaw]

Turned my B3 props brown, like rust. Makes me think the props are a low grade stainless

 

[billnpat]

My post reads hose down afterward....Thanks

 

[RollerCoastr]

Had you neutralized it even after the rinse, it's high likely that you'd have observed the tell-tale fizzing of some active acid, like I do when I clean around through-hull. Even when I think I've rinsed all traces away, something fizzes - like a spot on the back of my hand, or my wrist.

Hence my nervousness.

 

[billnpat]

Had you neutralized it even after the rinse, it's high likely that you'd have observed the tell-tale fizzing of some active acid, like I do when I clean around through-hull. Even when I think I've rinsed all traces away, something fizzes - like a spot on the back of my hand, or my wrist.

Hence my nervousness.

Absolutely

RIGHT......:thumbsup: Bottom line it does the job.....

 

[ttmott]

Hydrochloric acid (muriatic) attacks the copper in the bronze and will leave a pitted surface. Simple rinsing will not normally stop all of the etching process and in some of the worst cases will ruin the part. I would be very cautious both doing this regularly or with a strong solution.

 

[billnpat]

Hydrochloric acid (muriatic) attacks the copper in the bronze and will leave a pitted surface. Simple rinsing will not normally stop all of the etching process and in some of the worst cases will ruin the part. I would be very cautious both doing this regularly or with a strong solution.

Very good advice.....i dilute my acid by 75%.......forgot to mention that .....

 

[trit21]

You should neutralize the acid with baking soda which will then stop the etching process. Any acid left , even a small amount, can continue the etching process. BUT, this doesn't mean it will continue if it was rinsed enough. Water does not neutralize acid, just dilutes acid. Of course, if it is diluted enough, the acid is ineffective. Your probably ok if the boat is in the water.

 

[northern]

Not a metallurgist but you may break down the grain boundaries in the metal with an aggressive cleaning solution. If there are any metallurgist on the site they would be able to advise what could happen to the metal with an acid cleaning.
Once I cleaned my props by hand. I used 100 grit emery paper and many beers. They looked good for on season. It took half a day.