How I saved a seized friction welded crankshaft with drain cleaner (Sodium Hydroxide/Lye/NaOH).

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This is a crankshaft from a Siezed and flooded Honda GV200 lawnmower engine that I saved by removing the aluminum with Sodium Hydroxide (NaOH)

Sodium Hydroxide, known also as Caustic Soda and in some countries Lye, in a strong solution dissolves Aluminium. The really neat thing is that it does not affect other metals such as Carbide or HSS, carbon steel, or the coatings used on milling bits.

Noted: The concentration of the solution should be approximately 6 parts cold or lukewarm, (Not hot. The simple act of dissolving the powder will give off heat.), water to one part of powder measured by volume. Please use a pair of good rubber gloves and eye protection when making or handling the solution, and also do it outside.

What is sodium hydroxide (NaOH)?

Sodium hydroxide is sometimes called caustic soda or lye. It is a common ingredient in cleaners and soaps.

At room temperature, sodium hydroxide is a white, odorless solid. Liquid sodium hydroxide is colorless and has no odor. It can react violently with strong acids and with water. Sodium hydroxide is corrosive. NaOH can react with moisture from the air and may generate heat as it dissolves. This heat can be enough to cause a fire if it is near flammable materials.

Sodium hydroxide is useful for its ability to alter fats. It is used to make soap and as a main ingredient in household products such as liquid drain cleaners. Sodium hydroxide is usually sold in pure form as white pellets or as a solution in water.
What are some uses of sodium hydroxide?

Sodium hydroxide is used in bar soaps and detergents. Sodium Hydroxide is also used as a drain cleaner to unclog pipes.

Around 56% of sodium hydroxide produced is used by industry, with 25% of NaOH used in the paper industry. Some other uses include fuel cell production, curing food, removing skin from vegetables for canning, bleach, drain cleaner, oven cleaner, soaps, detergent, paper making, paper recycling, aluminum ore processing, oxide coating, processing cotton fabric, pickling, pain relievers, anticoagulants to prevent blood clots, cholesterol reducing medications, and water treatment.

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