How to Prevent Auto Battery Corrosion

Corrosion on automobile batteries is a naturally occurring process, caused by the sulfuric acid used in the batteries. When the battery is in use, the sulfuric acid releases small amounts of hydrogen gas, which combine with dirt, dust and oil in the car and cause corrosion, particularly on the metal parts of a battery. If too much corrosion builds up on the battery terminals or battery cables, the car may have problems starting. Cleaning and coating the terminals and cables at least every six months can help prevent corrosion from forming.

• 1

  Remove the negative battery cable from the negative battery terminal. Then remove the positive battery cable from the positive battery terminal. The negative battery cable is black, and the positive battery cable is red.

• 2

  Remove any corrosion from the battery. Mix eight ounces of water with 1 to 2 tbsp. of baking soda. Use a soft to medium-bristled cleaning brush to scrub the mixture onto any corrosion on the terminals, cables and battery. Allow the cleaning solution to soak into the corrosion for 15 to 20 minutes before wiping the area clean with a paper towel.

• 3

  Coat the battery terminals and ends of the battery cables with a spray-on corrosion preventative, sold in most automotive part stores, or petroleum jelly. Spray a thin, even layer of the corrosion preventative on the terminal and cables or dip a rag or cloth in petroleum jelly and then rub onto the terminal and cables to provide a thin, preventative coating. Allow it to dry for at least 30 minutes.

• 4

  Place the positive battery cable back on the positive battery terminal. Place the negative battery cable back on the negative battery terminal.