Promotion by Nitrates of the Dissolution of Tin by Acids and its Inhibition

Sherlock, J. C.; Britton, S. C.

doi:10.1179/000705973798321955

Cited by 30 publications

(11 citation statements)

References 5 publications

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“…The fact that the comparative effects of NO,-and CI-level of the nutrient solutions on the NO,-uptake and on detinning were similar and of the same order of magnitude further supports NO,as the major detinning agent in these canned tomato juice packs. The corrosion mechanism of tinplate by various food products has been the subject of extensive investigations (Farrow et a1 1970(Farrow et a1 , 1971Evans 1971 ;Board 1973;Sherlock and Britton 1973;Albu-Yaron and Semel 1976). It is accepted that in almost every deoxygenated acid food, tin becomes anodic to the steel base and corrodes to produce stannous ions (Sn2') and electrons.…”

Section: Plain Tinplate Cansmentioning

confidence: 99%

“…It was also shown (Board 1973;Sherlock and Britton 1973) that NO,-in canned acidic foods accelerates the slow anodic reaction of tin dissolution involved in most plain tinplate cans, by replacing the usually slow cathodic reaction with the electron-nitrate-nitrite two-step reduction reaction. In these reactions NO,serves as an electron acceptor or depolariser in a cathodic reaction taking place on the large tin electrode.…”

Section: Plain Tinplate Cansmentioning

confidence: 99%

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Effect of growing conditions on the corrosivity and ascorbic acid retention in canned tomato juice

Albu‐Yaron

Feigin

1992

J Sci Food Agric

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Tomatoes (Lycopersicon esculentum) (M82-1-8) grown hydroponically in a greenhouse experiment at 16 combinations of nitrate/chloride nutrient solutions were processed as juice and the canned product was stored at 22°C and 36°C for 27 months to study corrosion of the packs from the point of view of detinning or delamination of the internal lacquer and comparative retention of ascorbic acid content.Detinning in plain tinplate cans was greater with juices from tomatoes grown in high nitrate, low chloride solution as a result of the high nitrate content of tomatoes. Addition of chloride decreased the nitrate uptake of the tomatoes, thereby reducing detinning in plain cans significantly. A relevant positive correlation between detinning and high nitrate, high chloride nutrient regime after 27 months' storage was attributed to an increase in total acid (as anhydrous citric acid) content of the respective juices and hence increased corrosivity.Delamination, with underfilm corrosion, in lacquered cans was correlated with tomatoes grown under a higher nitrate, medium chloride regime, giving medium levels of nitrate (0-3M.65 mmol litre-l) and chloride (20-25 mmol litre-') but higher levels of acidity (2k37 mmol litre-' citric acid) in the juice. Tomatoes grown under a higher nitrate, low chloride regime exhibited nitrate concentrations as high as 1.0 mmol litre-' and high corrosivity. Tomatoes grown under low nitrate and increasing levels of chloride regimes gave juices containing as low as 0.18 mmol litre-' of nitrate but higher chloride concentrations up to 42 mmollitre-]; no delamination was observed in lacquered cans of these juices but some pitting corrosion and perforations occurred at the end of 27 months at 36°C.Ascorbic acid retention was mainly correlated with the type of can as well as with the initial ascorbic acid level of the raw tomatoes, itself the result of the interaction of C1-and NO,-in the nutrient solution. During 27 months' storage, the ascorbic acid retention was consistently higher in tomato juice canned in plain tinplate cans (88 YO at 22°C or 70 YO at 36°C) than in lacquered cans (24 % at 22°C or 18% at 36°C).

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Section: Plain Tinplate Cansmentioning

confidence: 99%

Section: Plain Tinplate Cansmentioning

confidence: 99%

Effect of growing conditions on the corrosivity and ascorbic acid retention in canned tomato juice

Albu‐Yaron

Feigin

1992

J Sci Food Agric

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“…In 0.1 M NaCl, the authors [14] obtaind one peak corresponding Various anode films were reported on Sn under different experimental conditions [l-31. The anodic behaviour of Sn in alkaline solutions was studied in detail [4-71. Nitrates were found to affect the anodic dissolution of Sn [8]. Anodic polarization measurements were made on Sn/Cd [9], Sn/Cu [lo], Sn/ Zn [11] and Sn/Ni alloys [12,131.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Polarization and Passivation of Tin in neutral solutions of chloride, bromide and iodide ions

Ammar

Darwish

Khalil

et al. 1982

Materialwissenschaft Werkst

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Abb. 12. Behalterteil mit 1350 mm Durchmesser (warmgcprefltcr Korbbogenboden verschweilit mit kaltgerundetem, zweiteiligen Man-telschul3 und eingeschweikm Stutzen von 150 mm Durchrqesser). Werkstoff: 1,5 mm Titan auf 16 rnm StE 355, walzplattiert BUS vorgesprengtem Halbzeug.Fig. 12. Cross-section of a container 1350 rnm in diameter (hotpressed dished head welded to a cold-formed. two-part casing and a connecting piece 150 mm in diameter). Material: 1.5 m m titanium on 16 m m StE 355, hot rolled from explosion-clad semi-finished matcrial.nahtverbindung des Grundwerkstoffs auch anzutreffen ist. Im SchweiBbereich der Titan-Auflage sind keine wesentlichen Hartesteigerungen beobachtet worden, Die Ubertragbarkeit der in Laborversuchen gewonnenen Erkenntnisse auf die betriebliche Praxis ist bei der Fertigung des in Abb. 12 dargestellten Behalterteils erprobt worden.Der warmgeprefite Boden von 1350 mm Durchmesser und der zweiteilige Mantel sind unter Retriebsbedingungen ver-schweiBt worden. In der Schweiljfolge standen zunachst die Stumpfnahtverbindungen am Grundwerkstoff mit den entsprechend artgleichen Zusatzen an, bevor die Titan-Schwei-Bung mit Abdeckstreifen zur Ausfiihrung gelangte. Abb. 12 1a1Jt erkennen, daB im Bereich der Bodenwolbung ein Stutzen als zusatzliches Konstruktionselement eingesetzt worden war.Der eingeschweike Stutzen hat eine lichte Weite von 150 mm.Er ist mit einer Auskleidung aus Titan versehen, die ihrerseits plattierungsseitig verschweiflt wurde. Der plattierte Werkstoff hat die an ihn gestellten Anforderungen beziiglich der Verarbeitbarkeit gut erfullt.Die diesem Bericht zugrundeliegenden Arheiten wurden mit Mitteln des Bundesministers fur Forschung uizd Technologie gefordert, wofiir auch an dieser Stelle gedankt sei.

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“…On the other hand, just these ligands, among those considered, are known to give the more stable complexes with Sn ions, in that they are all characterized by formation constants (b 1 and b 2 ) whose logarithm is of the order of about 6-7 and 12-14, respectively [33][34][35]. These arguments strongly suggest that Sn release is markedly affected by the ligands present in the medium contacting the can surface.…”

Section: Metal Release Into Canned Synthetic Samplesmentioning

confidence: 95%

A voltammetric approach to an estimate of metal release from tinplate promoted by ligands present in canned vegetables

et al. 2008

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A linear sweep voltammetric (LSV) approach is proposed for achieving rapid information on metal release from tinned containers into preserved vegetables. Chopped tomato and pea preserves were chosen as prototypes for acid and nearly neutral canned food, respectively. Metal release in these vegetables tinned into both bare and lacquered containers was compared with that found in synthetic samples containing some organic complexing agents (acetic, ascorbic, citric, malic, oxalic, pyroglutamic acids) present in the vegetables considered, thus showing that some of these components affected markedly the metal release in bare cans. These ligands were concomitantly found to also affect LSV profiles recorded in parallel at Sn and Fe electrodes in synthetic samples, causing the starting potential for their oxidation to be lower, the higher the ligand activity of the species considered. The data indicated that metal release and starting potentials for metal discharge are strictly related, so that LSV is able to provide rapid and useful information on the nature of the protective effect (electrochemical or physical) of tin on the steel underlayer, as well as on the extent of Sn and Fe release.

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Promotion by Nitrates of the Dissolution of Tin by Acids and its Inhibition

Cited by 30 publications

References 5 publications

Effect of growing conditions on the corrosivity and ascorbic acid retention in canned tomato juice

Effect of growing conditions on the corrosivity and ascorbic acid retention in canned tomato juice

Electrochemical Polarization and Passivation of Tin in neutral solutions of chloride, bromide and iodide ions

A voltammetric approach to an estimate of metal release from tinplate promoted by ligands present in canned vegetables

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