Resistance to organic acids

The austenitic irons are also useful in some circumstances for handling organic acids such as dilute acetic, formic and oxalic acids, fatty acids and tar acids. They are more resistant to organic acids than unalloyed cast irons, e.g. in acetic acid the austenitic irons show corrosion rates 20-40 times lower than the ferritic iron (Table 3.51). 

Piper, P., Calderon, C.O., Hatzixanthis, K. and Mollapour, M. (2001) Weak acid adaptation the stress response that confers yeasts with resistance to organic acid food preservatives . 

Nickel is resistant to organic acids dilute ammonium hydroxide (<2%) and to chlorination or fluorination. These alloys 200 and 201 are used in petrochemical, chemical industry, food industry and in the production of synthetic fibers. 

Polyamine-cured epoxy systems have reasonable colour and colour retention, improved physical properties and good chemical resistance. They are, however, moisture sensitive, relatively toxic and have poor resistance to organic acids. Examples of this class are diethylene triamine (DETA) and triethylene tetramine (TETA). 

Type of bacteria Sensitive to organic acid activity Resistant to organic acids Acid tolerance... 

They are also resistant to organic acids (citric, lactic, oleic, oxalic, stearic, tartaric, and imc) and most aldehydes and ketones at normal temperatures. They display limited resistance to hydrochloric, sulfonic, and phosphoric acids at ambient temperatures. 

Alloy 800 has excellent resistance to nitric acid at concentrations up to about 70%. It resists a variety of oxidizing salts, but not halide salts. It also has good resistance to organic acids such as formic, acetic, and propionic. Alloy 800 is particularly suited for the handling of hot corrosive gases such as hydrogen sulfide. 

The three-dimensionally crosslinked organic silicone compounds (typically used as coatings) are resistant to dilute alkalis and inorganic acids, but exhibit only limited resistance to organic acids, e.g., formic or acetic acid [32]. 

Demonstrates adequate resistance to organic acids such as acetic, formic, and stearic. 

Reactor vessels. Steel shells lined with zirconium alloys solve the most difficult corrosion problems in reactor vessels and tanks. Zirconium alloys plates can be welded to form vessels of any size. When used as a liner in steel vessels, the strength is enhanced. This can be accomplished as a loose lining, as a resistance welded lining, or as an explosively bonded lining. Large assemblies can be made with minimal weld joints. Zirconium alloys resistance to organic acids led to their acceptance as a... 

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