Feste Korrosionsprodukte – I. Magnesium, Zink, Cadmium, Blei und Kupfer

Grauer, R.

doi:10.1002/maco.19800311102

Cited by 31 publications

(14 citation statements)

References 112 publications

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“…Since corrosion under environmental conditions is a highly complex and diverse process, many techniques have been utilized to study, simulate and predict the effect of single parameters on the performance of zinc based protective coatings [1][2][3][4]. Under wet conditions, the electrolyte composition represents the most important parameter that determines the corrosion behaviour [3,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen carbonate and chloride on zinc corrosion investigated by a scanning flow cell system

Laska

Auinger

Biedermann

et al. 2015

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Effect of hydrogen carbonate and chloride on zinc corrosion investigated by a scanning flow cell system

Laska

Auinger

Biedermann

et al. 2015

Electrochimica Acta

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“…[1][2][3] The general pictures of the atmospheric corrosion of galvanised steel have been summarised in several review articles. [4][5][6][7][8][9] In view of the widespread use of galvanised steel in Saudi Arabia, it was considered desirable to study its corrosion behaviour in the wide variety of marine and marine industrial atmospheres. As already recognised, galvanised steel corrodes at different rates in different locations, and the main factors determining the corrosivity of a site are the humidity of the corroding surface and pollution level of the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Studies of galvanised steel atmospheric corrosion in Saudi Arabia

Syed

2011

Corrosion Engineering, Science and Technology

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This paper summarises the results obtained for galvanised steel specimens exposed in Saudi Arabia region for four years at four pure marine and five mixed marine (SO 2 polluted) sites. The atmospheres at these sites were characterised climatologically and in terms of their pollution level so that their corrosivity could be expressed in accordance with ISO standards. Chemical characterisation of the galvanised steel corrosion product layers was performed using X-ray diffraction. The main phases determined were zincite (ZnO), simonkolleite [Zn 5 (OH) 8 Cl 2 .H 2 O], smithsonite (ZnCO 3 ), magnetite (Fe 3 O 4 ), gordaite [NaZn 4 (SO 4 )Cl(OH) 6 Cl.6(H 2 O)], hematite (Fe 2 O 3 ), zinkosite (ZnSO 4 ), zinc chloride (ZnCl 2 ), zinc hydroxide sulphate hydrate [(Zn(OH) 2 ) 3 (ZnSO 4 )(H 2 O) 3 ] and zinc sulphate hydroxide hydrate [ZnSO 4 (OH) 2 .5H 2 O] was found on the specimens. The results obeyed well with the empirical kinetics equation of the form C5Kt n ,where K and C are the corrosion losses in mg cm 22 after 1 and 't' years of the exposure respectively, and 'n' is constant. Based on 'n' values, the corrosion mechanism of galvanised steel is predicted. The results obtained show that the corrosion rate of galvanised steel is a function of both the chloride, SO 2 pollution level and the humidity. Corrosion rate of galvanised steel specimens have been obtained by loss of weight after each year of exposure. Experimental Specimen preparationGalvanised steel specimens with 99?63% (0?22%Mn, 0?1%S, 0?12%P, 0?04%C and 0?01%Si) purity were used in this experiment. Before exposure, the surface of the

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“…The thin film of corrosion products, which forms on the zinc surface under these conditions, is merely invisible to unaided eye. Nevertheless, according to literature it has to be assumed that such a film exists, that mainly consists of zinc hydroxycarbonates such as Zn 4 CO 3 (OH) 6 · H 2 O and Zn 5 (OH) 6 (CO 3 ) 2 (hydrozincite) …”

Section: Resultsmentioning

confidence: 99%

“…The presence of carbon dioxide in air or water films from rain and air humidity causes the formation of carbonates. Presuming the content of 0.04 vol% CO 2 in air, the transformation of zinc oxide or hydroxide to Zn 5 (OH) 6 (CO 3 ) 2 (hydrozincite) takes place within hours up to days after exposure . LeBozec et al have pointed out that in the presence of carbon dioxide and chlorides the transformation of simonkolleite to hydrozincite and vice versa is possible according to (Eq.…”

Section: Introductionmentioning

confidence: 99%

The combination of minimally invasive electrochemical investigations and FTIR‐spectroscopy to analyze atmospheric corrosion product layers on zinc

Langklotz

Babutzka

Schneider

et al. 2019

Materials & Corrosion

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The present work describes the combination of electrochemical investigations by using a gel-type electrolyte with Fourier-transformed infrared spectroscopy to investigate partially extremely thin corrosion product films on titanium-zinc. The gel pad method enables the determination of corrosion relevant parameters such as the potential and the linear polarization resistance without altering the corrosion product layers, which are extremely prone to re-dissolution when freshly formed. Complementary infrared spectroscopy enables the determination of main compounds of even very thin surface layers of few tenth of nanometers with a certain lateral resolution. It was found that zinc forms mostly zinc carboxyhydroxides such as hydrozincite, under various exposure conditions. The protective properties of these hydrozincite layers depend on the structure of the corrosion product film rather than on its thickness. In mid-term exposure tests, shallow corrosion pits were found even in the absence of corrosive agents such as chloride. K E Y W O R D Scorrosion investigations, gel-type electrolytes, infrared spectroscopy, titanium-zinc | INTRODUCTIONZinc plays a prominent role in corrosion prevention. Almost half of the 13 million tons of the annual production is used as anti-corrosive layer for steel components [1] particularly under atmospheric conditions. For that reason, the corrosion behavior of zinc and the formation of reaction products has been intensively investigated over decades. The recently published critical review by Wallinder and Leygraf [2] very impressively summarizes current and future research activities. The standard potential of zinc is rather negative E 0 Zn=Zn 2þ ¼ À0:76 V SHE , being reason why zinc usually dissolves in acidic solutions (Eq. (1)) under hydrogen evolution (hydrogen corrosion):This reaction occurs spontaneously (ΔG 0 < 0) and expresses the high reactivity of zinc. However, according to Kruse [3] the hydrogen corrosion of zinc in water at low temperatures is kinetically inhibited and can be neglected. Only the oxygen corrosion under formation of hydroxides has to be regarded (Eq. (2)):

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Feste Korrosionsprodukte – I. Magnesium, Zink, Cadmium, Blei und Kupfer

Cited by 31 publications

References 112 publications

Effect of hydrogen carbonate and chloride on zinc corrosion investigated by a scanning flow cell system

Effect of hydrogen carbonate and chloride on zinc corrosion investigated by a scanning flow cell system

Studies of galvanised steel atmospheric corrosion in Saudi Arabia

The combination of minimally invasive electrochemical investigations and FTIR‐spectroscopy to analyze atmospheric corrosion product layers on zinc

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