Does Rust Affect Metal’s Strength?

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Presentation transcript:

Does Rust Affect Metal’s Strength? Carolyn Riegel Grade Nine

Problem What solution will cause the most rust, thus resulting in the weakest metal?

Research Rust, occurs when certain metals are exposed to oxygen and water The water that hits the surface of the metal will form with carbon dioxide to become acid The rest of the water will separate into its two elements, hydrogen and oxygen. Oxygen will combine with the acid to create iron oxide When regular water is used in the rust process it forms an acidic solution that acts as a catalyst. If sodium chloride is used, no solution is needed because it is already a catalyst. Sodium hypochlorite is a potent oxidizer and readily accepts electrons from the metal

Hypothesis If steel wool is soaked in three different solutions, the sodium chloride solution will cause the steel wool to require the least amount force to rip apart.

Materials 9 beakers 12 pieces of steel wool ( about .75 grams each) Distilled water ( 100 milliliters in three beakers) 10% sodium chloride concentration with distilled water in three beakers 10% sodium hypochlorite concentration with distilled water in three beakers Force Logger Pro Software Computer

Procedure Each steel wool piece was cut Beakers were filled with different solutions Steel wool placed in each respective beaker After 3 days, steel wool was removed from beakers and allowed to dry off Force Logger Pro was used to test the force needed to rip the steel wool Data was recorded Independent variable: solution steel wool is placed in Dependent Variable: durability of the steel wool Constants: type of steel wool, time steel wool was in solution, temperature of room Control: steel wool placed in distilled water solution, steel wool not placed in any solution

Data

Conclusion Hypothesis : If steel wool is soaked in three different solutions, the sodium chloride solution will cause the steel wool to require the least amount force to rip apart. Hypothesis supported based on my results

Works Cited Netrekker. N.p., n.d. Web. 13 Dec.2011. <http://school.nettrekker.com/ goPage?np=/home.ftl>. "Rust." Science Online. N.p., n.d. Web. 11 Dec. 2011. <http://www.fofweb.com/ Science/default.asp>. Salt and Oxidation." Student Resource Center. N.p., n.d. Web. 17 Dec. 2011.