Cathodic protection of ships in brackish water

Aromaa, Jari; Pehkonen, Antero; Forsén, Olof

doi:10.1007/s10008-006-0111-5

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Namely, it is well known that solubility of oxygen decreases with increasing temperature and salinity. Since oxygen reduction is the main cathodic reaction in both electrolyte, the cathodic reaction exhibits a higher rate in brackish water …”

Section: Resultsmentioning

confidence: 99%

The effect of temperature on corrosion behavior of AA5083 in brackish water and seawater

Lokas

Alar

2019

Materials & Corrosion

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Section: Resultsmentioning

confidence: 99%

The effect of temperature on corrosion behavior of AA5083 in brackish water and seawater

Lokas

Alar

2019

Materials & Corrosion

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“…Increase in rotating speed shifts the corrosion potential to more noble values and increases the limiting current density of oxygen reduction reaction. Based on the limiting current density values, the current demand for a moving vessel can be ten times higher than for stationary vessel [6,7]. The current demand is higher for low-salinity water for stationary systems, but already at relatively low flow rate the cathodic reaction rates are the same.…”

Section: Resultsmentioning

confidence: 99%

Factors Affecting Corrosion in Gulf of Finland Brackish Water

Aromaa

Forsén

2016

International Journal of Electrochemistry

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The Baltic Sea is a relatively shallow inland sea surrounded by the countries of North-Eastern Europe and Scandinavia. The brackish water in the Baltic Sea has low salt concentration and it is typically one-sixth of the ocean seawater. The “nominal” amount of dissolved solids, upon which formulae for artificial seawater are based, is about 34,500 ppm, of which most is sodium chloride. The major constituents are those whose concentrations are greater than 1 mg/L and are not greatly affected by biological processes. The ratio of concentrations of these ions and molecules to each other is relatively constant. Corrosion rates were determined in long-term tests in Gulf of Finland brackish water off Helsinki. The water temperature varies through the year from about 0°C in January to 15-16°C in June to August. Salinity is 4–6‰, highest at the end of summer and lowest when ice melts. pH is between 7.0 and 8.1. Weight loss tests from one- to four-year tests for steel, stainless steel, copper, aluminium, zinc, and galvanized steel are reported and compared to short term laboratory tests in artificial seawater. Tests for passivation rates and crevice corrosion for stainless steel are discussed in terms of environment variation. The effect of corrosion on strength of steel is also discussed.

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“…The efficiency and economics of CP rely largely on the rate and chemistry of these deposits, and delivery of the protection currents that would otherwise be required would be improbable. The formation of calcareous deposits is influenced by a number of factors such as hydrodynamics (Mentel et al 1992), water temperature (Kunjapur et al 1987;Lin & Dexter 1988; Barchiche et al 2003), pressure (Chen et al 2003), salinity and alkalinity (Aromaa et al 2006;Eashwar et al 2009), and biological fouling (Edyvean & Moss 1986;Mansfeld et al 1990;Dexter & Lin 1992;Little & Wagner 1993;Eashwar et al 2009). …”

Section: Introductionmentioning

confidence: 97%

Sunlight-enhanced calcareous deposition on cathodic stainless steel in natural seawater

et al. 2013

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In replicate series of experiments in natural seawater, one in full darkness and the other in a 1:1 diurnal cycle with as little as ~5% of natural solar illumination, sunlight promoted calcareous deposition on cathodic stainless steel surfaces. As exemplified by scanning electron microscopy, the deposit that formed under the natural diurnal cycle, in the presence of photosynthetic biofilms, was composed of finer calcareous crystals that provided more compact and more uniform surface coverage than the one formed in the dark. The light-enhanced deposit also possessed better scale properties, as suggested by X-ray analysis and electrochemical measurements. Sunlight enhancement of calcareous deposition looked all the more conspicuous when day and night regimes were examined independently. These results not only bear important implications for cathodic protection in marine waters, but also provide an intriguing analogy to coral reef calcification.

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Cathodic protection of ships in brackish water

Cited by 5 publications

References 3 publications

The effect of temperature on corrosion behavior of AA5083 in brackish water and seawater

The effect of temperature on corrosion behavior of AA5083 in brackish water and seawater

Factors Affecting Corrosion in Gulf of Finland Brackish Water

Sunlight-enhanced calcareous deposition on cathodic stainless steel in natural seawater

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