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Performance of Corrosion-Resistant Alloys in Acidic Chloride Solutions containing Bleach

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Bleach is widely used domestically or industrially in many fields. For example in water treatment, bleach is a very effective additive for disinfection and odor control. It is used for treating polluted water containing organic contaminates and waterborne pathogens.

Product Number: 51323-19338-SG
Author: Ling Chen, Vinay Deodeshmukh, Ajit Mishra
Publication Date: 2023
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Bleach has widespread applications in various industries, including pulp and paper, and water treatment. One of the key ingredients of bleach is sodium hypochlorite, which is a strong oxidant. Although sodium hypochlorite is extensively used in various industries, there is always a concern about failure of metallic components due to localized corrosion, especially in low pH-chloride solutions at elevated temperatures.


There are various alloying elements (including Nickel) that can catalyze pure sodium hypochlorite which limits the usage of a wide range of commercial alloys in bleach. However, in the chemical industry, process conditions seldom contain only sodium hypochlorite but rather a mixture of chemicals. Generally, titanium alloys are the preferred option in solutions containing bleach.


In the present study, several commercial alloys (Iron-base alloys, Nickel-base alloys, and Titanium-base alloys) were evaluated at elevated temperatures in low pH chloride solutions containing different concentrations of sodium hypochlorite. The results have shown no noticeable corrosion attack on base metal and welded regions of N06022, N06200 and R50400 alloy, whereas extensive corrosion attack on iron-base alloys (S31600, N08904 and N08367) occurred.

Bleach has widespread applications in various industries, including pulp and paper, and water treatment. One of the key ingredients of bleach is sodium hypochlorite, which is a strong oxidant. Although sodium hypochlorite is extensively used in various industries, there is always a concern about failure of metallic components due to localized corrosion, especially in low pH-chloride solutions at elevated temperatures.


There are various alloying elements (including Nickel) that can catalyze pure sodium hypochlorite which limits the usage of a wide range of commercial alloys in bleach. However, in the chemical industry, process conditions seldom contain only sodium hypochlorite but rather a mixture of chemicals. Generally, titanium alloys are the preferred option in solutions containing bleach.


In the present study, several commercial alloys (Iron-base alloys, Nickel-base alloys, and Titanium-base alloys) were evaluated at elevated temperatures in low pH chloride solutions containing different concentrations of sodium hypochlorite. The results have shown no noticeable corrosion attack on base metal and welded regions of N06022, N06200 and R50400 alloy, whereas extensive corrosion attack on iron-base alloys (S31600, N08904 and N08367) occurred.

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