Help support WeTheArmed.com by visiting our sponsors.

Author Topic: What causes battery post corrosion?  (Read 8930 times)

g.willikers

  • Senior Member
  • ***
  • Posts: 804

  • Offline
What causes battery post corrosion?
« on: February 26, 2009, 06:03:24 PM »
Anyone know what may cause the battery negative post to corrode with a green powder that coats the post and cable connection.
After cleaning, it's back in less than two weeks and interferes with the car's electrical system.
The positive side rarely has any and very little when it does.
Thanks for any replies.
Trust No One


Help support WeTheArmed.com by visiting our sponsors.

Thernlund

  • WTA Staff
  • Senior Contributor
  • *****
  • Posts: 13966

  • Offline
Re: What causes battery post corrosion?
« Reply #1 on: February 26, 2009, 06:31:17 PM »
Exposure.  You need to remove the cables and clean them and the terminals very well with water and baking soda, then seal them.  At the auto parts store you can usually find a spray that will do the trick.  It's usually red or blue.

You can also use felt gaskets on the posts or silicone grease at the base of the posts (or both) to help stop the acid and gases from leaking and corroding the cable.

The reason it's only the negative post is that the battery is being under-charged and left that way.  Sulfation occurs on the negative post in this condition.  If corrosion was on the positive post, that would indicate a consistent over-charge condition.

But an under-charge is sort of expected in a car, as the battery is charged and discharged quite a bit.  As such, rarely is it at full charge.

Just clean and seal up the posts.  Should be ok then.  Do it soon too.  Corrosion can and will affect battery performance and eventually ruin the battery.


-T.
Arizona  Arm yourself because no one else here will save you.  The odds will betray you, and I will replace you...

g.willikers

  • Senior Member
  • ***
  • Posts: 804

  • Offline
Re: What causes battery post corrosion?
« Reply #2 on: February 26, 2009, 08:00:47 PM »
Roger that and thanks.
Didn't batteries come with felt washers on the battery posts, once upon a time?
Always good answers dis here place.
Is WTA great or what.
Very glad to have found you all.
Trust No One

THE NORSEMAN

  • To preserve liberty, it is essential that the whole body of the people always possess arms, and be taught alike, especially when young, how to use them. - Richard Henry Lee
  • Moderator
  • Senior Contributor
  • *****
  • Posts: 4948

  • Offline
Re: What causes battery post corrosion?
« Reply #3 on: February 27, 2009, 08:50:08 AM »
A couple other hints to go with the above:

1.  Unhook the negative cable first, and hook it up last.  In other words always try to make or break the circuit on the negative post.

2.  As you pull the cables off or put them on, turn your face away as you make contact with the posts.  It's VERY rare but possible to have a battery explode( it's actually the hydrogen gas they put off) when making or breaking the circuit.  I've seen it happen just once, to my grandfather years ago.  But because he had his head turned, he still has both eyes and the hair just grew back.
This may be considered as the true palladium of liberty. . . . The right of self defence is the first law of nature: in most governments it has been the study of rulers to confine this right within the narrowest limits possible. Wherever standing armies are kept up, and the right of the people to keep and bear arms is, under any colour or pretext whatsoever, prohibited, liberty, if not already annihilated, is on the brink of destruction- St. George Tucker, Blackstone's Commentaries

coyotesfan97

  • WTA LEO
  • Senior Contributor
  • *****
  • Posts: 2776
  • Life's Short Bite Hard!

  • Offline
Re: What causes battery post corrosion?
« Reply #4 on: February 27, 2009, 11:33:12 AM »
I have used Coca Cola to clean the posts.  I like getting a disposable cup and dip the cable ends too.


I saw my dad blew up a battery one time.  He was jumping starting his old MG and forgot English cars have positive ground.  BOOOM!!   :doh  No one hurt.  A neighbor who lived about a 1/4 mile away heard it and ran over to our house to check what happened.
ArizonaThe bravest are surely those who have the clearest vision of what is before them, glory and danger alike, and yet notwithstanding, go out to meet it.  Thucydides 471BC

"Hey!  Let's be careful out there." Sgt Phil Esterhaus played by Michael Conrad

Outbreak

  • NRA Basic Pistol Instructor, Certified Sig P-Series Armorer
  • WTA Staff
  • Senior Contributor
  • *****
  • Posts: 11138
  • Outbreak Monkey ^

  • Online
Re: What causes battery post corrosion?
« Reply #5 on: February 27, 2009, 01:31:06 PM »
He was jumping starting his old MG and forgot English cars have positive ground.  BOOOM!!   :doh 

Hmm...didn't know that about Brit cars.
TexasOutbreak

I take my coffee black...like my rifles.

I absolutely despise Glocks. That's why I only own two.

I'm glad that your chains rest lightly upon you. --JesseL

g.willikers

  • Senior Member
  • ***
  • Posts: 804

  • Offline
Re: What causes battery post corrosion?
« Reply #6 on: February 27, 2009, 03:48:14 PM »
Positive grounds! What can ya' expect from the goofy (er, excuse me - the eccentric) Brits.
Fortunately, they quit doing that decades ago.
But they still drive on the wrong side of the road.
Some MGs had two 6 volt batteries in series to make 12 volt, both mounted under a hatch right behind the driver and passenger.
What me worry?
Another version of the MG had the electric fuel pump wired in series with the tail lights. If the light bulb blew, the pump quit.
Some people think MG means Morris' Garage, but it really mean MiGraine (as in headache).
But their beer is good.
Trust No One


Help support WeTheArmed.com by visiting our sponsors.

Outbreak

  • NRA Basic Pistol Instructor, Certified Sig P-Series Armorer
  • WTA Staff
  • Senior Contributor
  • *****
  • Posts: 11138
  • Outbreak Monkey ^

  • Online
Re: What causes battery post corrosion?
« Reply #7 on: March 09, 2009, 02:55:34 AM »
Positive grounds! What can ya' expect from the goofy (er, excuse me - the eccentric) Brits.
Fortunately, they quit doing that decades ago.
But they still drive on the wrong side of the road.
Some MGs had two 6 volt batteries in series to make 12 volt, both mounted under a hatch right behind the driver and passenger.
What me worry?
Another version of the MG had the electric fuel pump wired in series with the tail lights. If the light bulb blew, the pump quit.
Some people think MG means Morris' Garage, but it really mean MiGraine (as in headache).
But their beer is good.


Holy crap! That's exactly why all automotive engineers should be prior grease-monkeys.
TexasOutbreak

I take my coffee black...like my rifles.

I absolutely despise Glocks. That's why I only own two.

I'm glad that your chains rest lightly upon you. --JesseL


Help support WeTheArmed.com by visiting our sponsors.