Until now, citric acid has rarely been used in space, and so its performance has not been fully demonstrated.
A TDE activity (T724-403QT) with ESR Technology in the UK wanted to evaluate the suitability of a citric acid process for replacing health hazardous nitric acid processes used for passivating typical stainless steel grades used in spacecraft and ground support structures.
To assess the suitability of citric acid, three stainless steel grades, made from various metallurgical types (austenitic, precipitation-hardened and martensitic) were studied in both welded and non-welded conditions.
Extensive testing (chemical composition, corrosion resistance, and mechanical properties) of the specimens was performed and compared with specimens passivated with nitric acid.
The results of this activity demonstrated equal or better performance in corrosion resistance and mechanical properties for stainless steel specimens passivated with the more environmentally friendly citric acid process.
The activities success has led to a follow-up activity being included in the GSTP Clean Space compendium.
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Soda ash dense
Caustic Soda, Caustic Soda Flakes, Soda Ash, Sodium Sulfide, Pvc Resin - Jiahengyuan,https://www.jiahengyuanchem.com/