Salt concentration increases the rate of metal rusting
The claim that salt concentration increases the rate of metal rusting is contested by experimental findings; while chloride ions promote pitting and corrosion in certain stainless steels and alloys, high salt concentrations have conversely been observed to decrease general carbon and mild steel corrosion rates under specific environmental conditions.
The retrieved papers present mixed evidence regarding the effect of salt concentration on metal corrosion. Papers 2, 3, and 5 support the idea that chlorides promote corrosion, increase corrosion currents, or cause severe pitting in various alloys and stainless steels. Conversely, Papers 0 and 1 explicitly find that higher sodium chloride concentrations can significantly slow down or decrease general corrosion rates for carbon and mild steels under specific conditions (such as CO2 or H2S environments). Because the effect of salt is heavily dependent on the metal type, alloy composition, and environmental context (general corrosion vs. localized pitting), the balance of evidence is contested rather than uniformly supportive.
The evidence we hold leans leans supported
How this was weighed
official record 3x · fact-check 2x · hedged 1x · crowd & reference 1x
- Kinetics of Pitting Dissolution of Austenitic Stainless Stee · peer-reviewed · supports · weight 1.3 · 2012
- Corrosion Behavior in Sodium Sulfate and Sodium Chloride Sol · peer-reviewed · supports · weight 1.3 · 2004
- The Effect of Sodium Chloride Concentration on Corrosion Res · peer-reviewed · supports · weight 1.05 · 2017
- Sodium Chloride Concentration Effects on General CO2 Corrosi · peer-reviewed · refutes · weight 1.3 · 2013
- Effects of Sodium Chloride Concentration on Mild Steel Corro · peer-reviewed · refutes · weight 1.3 · 2011
M. Saadawy. Kinetics of Pitting Dissolution of Austenitic Stainless Steel 304 in Sodium Chloride Solution. 2012. https://doi.org/10.5402/2012/916367
Paper 2 finds that the addition of chloride ions reduces protective passive film growth and increases corrosion currents on stainless steel.
H. Fang, B. Brown, S. Nešić. Sodium Chloride Concentration Effects on General CO2 Corrosion Mechanisms. 2013. https://doi.org/10.5006/0222
Paper 0 finds that high sodium chloride concentrations decreased the general CO2 corrosion rate of carbon steel significantly and nonlinearly.
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F. Zucchi, G. Trabanelli, V. Grassi, A. Frignani. Corrosion Behavior in Sodium Sulfate and Sodium Chloride Solutions of SiCp Reinforced Magnesium Alloy Metal Matrix Composites. 2004. https://doi.org/10.5006/1.3287744
Paper 3 demonstrates that dissolution rates of magnesium alloy metal matrix composites are exceptionally high in chloride solutions compared to sulfate solutions.
Andi Rustandi, Suganta Setiawan, Ihsan Fathurrahman. The Effect of Sodium Chloride Concentration on Corrosion Resistance of Austenitic Stainless Steel 316L and SMA Weldment. 2017. https://doi.org/10.4028/www.scientific.net/ssp.263.120
Paper 5 shows that austenitic stainless steel and weldments experience severe pitting corrosion and lowest impedance magnitudes at specific NaCl concentrations like 3.5%.
H. Fang, B. Brown, S. Nešić. Effects of Sodium Chloride Concentration on Mild Steel Corrosion in Slightly Sour Environments. 2011. https://doi.org/10.5006/1.3546847
Paper 1 demonstrates that high salt concentrations significantly slowed down the reaction rate in mild steel corrosion under low H2S environments.
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