Corrosion anti-corrosive agent

In a similar study, Gray et al. (60) investigated the possible formation of N-nitrosamines in heated chicken frankfurters which been prepared with various levels of nitrite (0-156 mg/kg). As expected, apparent N-nitrosamine levels increased with increasing concentrations of nitrite, but did not exceed 4 yg/kg except for two samples which contained 8 and II yg/kg of NMOR. The presence of these relatively high levels of NMOR was confirmed by mass spectrometry and raised the question as to its mode of formation. It was shown to be due to the morpholine present in the steam entering the smokehouse, as this amine is commonly used as a corrosion inhibitor in steam process equipment ( ). The detectable levels of NMOR in the Canadian study ( ) were also attributed in part to the use of morpholine as an anti-corrosion agent in the steam supply (62). 

Fourier transform infrared reflection-absorption spectroscopy (FT-IFRAS) is applied to the study of corrosion protection of copper by an organic coating. Poly-N-vinyliroidazole (PVI(D) and poly-4(5)-vinylimidazole (PVI(4)) are demonstrated to be effective new polymeric anti-corrosion agents for copper at elevated temperatures. Oxidation of copper is suppressed even at 400° C. PVI(1) and PVI(4) are more effective anti-oxidants than the most commonly used corrosion inhibitors, benzotriazole and undecyllmldazole, at elevated temperatures. These new polymeric agents are water soluble and easy to treat the metal surface. 

Azole compounds such as benzotriazole, benzimidazole, indazole and imidazoles are efficient anti-corrosion agents for copper and copper-base alloys [1-10]. Many experimental techniques [11-15] have been used to study the corrosion inhibition mechanisms, however, the mechanisms are still not well understood. It is believed that the complex formation between copper and nitrogen atoms would inhibit oxygen adsorption on copper surface [16-20]. 

Even without heating it is likely that in the course of each pass there will be some release of volatile material—like water vapour, plasticizer, extender, or processing aids (anti-static agent or lubricant). There must be opportunity for such substances to be vented and carried away the die or tool must be capable of resisting attack by volatiles (suitably plated if they are corrosive), and designed to prevent an accumulation of released materials. Special hardened... 

Anti-corrosion agents Anti-static agents Candles... 

Some of these polymers are thermally stable, some have high molecular weight (150000), some are soluble in organic solvents, some are fusible, some can be cast into films. These polymers have been suggested as viscosity stabilizers for oil, grease thickners, anti-static agents, and corrosion resistant coating for metals. 

Cadmium (Cd) is a non-essensial metal used in industry as an anti-corrosive agent, and is found as a contaminant in food and also in cigarette smoke. The most serious consequence of chronic Cd poisoning is lung- and prostate cancer but the first effect during chronic intake is kidney damage, manifested by marked proteinuria [164]. Under chronic exposure, cadmium is primarily taken up by the liver, where it induces synthesis of metallothionein (MT) and induces formation of cadmium-metallothionein complexes. 

Barium chromate is used in the following applications as an anti-corrosive agent, as a pigment in paint, in ignition control devices, in safety matches, as a constituent in pyrotechnic compositions, and as a coloring agent in ceramics. 

The antiulcerogenic effect of the bark of V. africana was also reported using different experimental models. Tan and collaborators (2, 49) showed the cytoprotection of aqneons extracts for the gastric mucosa against erosive action of corrosive agents (HCl/ EtOH). Thns, V. africana possess anti-ulcer properties and these properties were not related with an increase on mucus production, or reduced pepsin activity, however the cytoprotection was related to a mechanism involving the physico-chemical re-enforcement of the gastric mucous layer. 

Additives used for metal forming lubricants primarily include extreme pressure agents such as sulphurized fats and oils, sulphochlorinated fats and oils, anti-weld agents, corrosion inhibitors, buffers (alkaline reserve), biocides and chemicals used to formulate emulsions. Fatty acids or fatty compounds, as well as graphite or molybdenum disulphide, can also be used as additives. 

Some additives used as anti-wear agents can also have anti-corrosion properties such as TCP, sebacic acid and azelaic acid. However, corrosion inhibition is a fine balance of competition with the anti-wear/load-carrying capability of the lubricant. Like the anti-wear additive, the corrosion inhibitor is designed to react with the metal surface. Some corrosion inhibitors specifically aimed at preventing static water corrosion of ferrous metals compete with the anti-wear additive for the metal surface to the extent that the resulting lubricant has poorer anti-wear properties than non-corrosion-inhibited lubricants. 

Synprolam. [ICI PLC] Emulsifier, anti-caking agent, sanitizer, biocide, corrosion inhibittx , antistat, conditioner, lubricant fcx personal care prods., cleaners, textiles, plastics, rubber. 

Kasolv . [PQCoip.] Hydrous potassium silicate powders adhesives, binders, surfactants, coagulants, flocculants, emulsifiers, dispersants, soil anti-tedepositkm agents, corrosion inhibitors. 

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