An Assessment of Nine Accelerated Atmospheric Corrosion Sites on the Cosmetic Corrosion Performance of the AISI Materials - Interim Report

Lutze, Frank W.; Shaffer, Ron

doi:10.4271/912278

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…A number of researchers have investigated the use of accelerated cyclic tests which incorporate climatic cycles. In the automotive sector, considerable research [13][14][15] has been undertaken to assess the test, which most accurately duplicates service performance, and the effect of test variables on corrosion rate. These studies found that the key factors controlling corrosion rate were the method and level of salt application 13 and the ratio of the period of time when the surface was wet compared with when it was dry.…”

Section: Summary Of Time To Dry On Seasonal and Annual Basismentioning

confidence: 99%

“…14 The effect of drying time was not explicitly examined. The test that was most similar to field conditions 15 was the GM 9540P Method B, which intersperses salt mist applications with ambient conditions for four cycles followed by a high humidity period, then a low humidity, high temperature drying period. Therefore, it appears that cyclic conditions are necessary to develop reliable accelerated tests, and the aggressivity of such tests does depend on the nature of the wetting and drying cycles.…”

Section: Summary Of Time To Dry On Seasonal and Annual Basismentioning

confidence: 99%

“…Drying time variation should be incorporated into models of atmospheric corrosion, such as the one being develop by Cole et al 10 Lastly, there is increasing evidence 11,12 that corrosion processes are controlled by the time of given events (rather than total time). Furthermore, if accurate accelerated cyclic tests [13][14][15] are to be developed to duplicate atmospheric corrosion in the field, it is critical that the drying cycles in such tests reflect the actual drying cycles experienced in the exterior environment.…”

Section: Introductionmentioning

confidence: 99%

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Experimental determination of time taken for openly exposed metal surfaces to dry

Cole¹,

Ganther²

2006

Corrosion Engineering, Science and Technology

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The time taken for wetness sensors on zinc plates, openly exposed to the atmosphere, to dry was analysed at four sites in southern Australia. The sites cover a range of environmental conditions from inland to marine. A number of typical drying patterns were observed, and it was found that these patterns could be related to the environmental severity and the probable presence of various salt contaminants. Therefore, at the marine site drying was frequently slow (.4 h) and appeared to be controlled by the presence of salts with a low deliquescent relative humidity (DRH) such as MgCl 2 . In contrast, at the inland sites drying was generally more rapid, which was consistent with either the drying of a clean surface or that of a surface controlled with salts of high DRH such as NaCl. The present paper presents histograms of drying rate for each site and the relationship between the distributions in drying rate and the environmental conditions is discussed. The relevance of the present study to modelling of atmospheric corrosion and to the design of cyclic tests to duplicate atmospheric corrosion is also discussed.

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Section: Summary Of Time To Dry On Seasonal and Annual Basismentioning

confidence: 99%

Section: Summary Of Time To Dry On Seasonal and Annual Basismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental determination of time taken for openly exposed metal surfaces to dry

Cole¹,

Ganther²

2006

Corrosion Engineering, Science and Technology

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“…As yet, there have been no accelerated cyclic test procedures specifically for atmospheric corrosion, however, there have been significant investigations into the most suitable tests for duplicating automotive body corrosion. The test found to be most similar to field conditions 17 was GM 9540P method B, which intersperses salt mist applications with ambient conditions for four cycles, followed by a high humidity period (7 h), followed by a low humidity, high temperature drying period. This test would thus appear to include our wetness mode B (although somewhat shorter than observed in the field), but would not include either the short or the long wetness periods.…”

Section: C~a(tow)|(pollutantzb)dmentioning

confidence: 89%

Experimental determination of duration of wetness on metal surfaces

Cole¹,

Ganther²

2008

Corrosion Engineering, Science and Technology

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The present paper analyses the time that wetness sensors on Zn and galvanised steel plates stayed wet in four locations within Australia: two in inland zones, one in a marine zone, and the other in a severe marine zone. All locations are classified as having a temperate climate. At each location, wetness was determined from interdigitated gold grids in thermal contact with plates openly exposed to the atmosphere. Individual periods of wetness were analysed, and it was found that the duration of wetness fell into three modes: short wetness periods of 1-4 h, but centred on ,2 h; part day wetness periods of 8-20 h, depending on environmental severity; and multiple day wetness periods of three to five days, but with odd occurrences out to 20 days. The relative occurrence of each mode depended on the severity of the sites. To illustrate the dependence of corrosion events on the duration of wetness, time factors regulating secondary spreading were examined. It was observed that secondary spreading on Zn and galvanised steel only occurred if the duration of a drop on a plate exceeded certain critical limits. Furthermore, the spread of secondary spreading was highly dependent on the time period for which the drop remained stable. The implication of these findings to developing accelerated tests and to modelling atmospheric corrosion are discussed.

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Corrosion protection assessment of sacrificial coating systems as a function of exposure time in a marine environment

Schmidt

Shaw

Sikora

et al. 2006

Progress in Organic Coatings

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An Assessment of Nine Accelerated Atmospheric Corrosion Sites on the Cosmetic Corrosion Performance of the AISI Materials - Interim Report

Cited by 7 publications

References 10 publications

Experimental determination of time taken for openly exposed metal surfaces to dry

Experimental determination of time taken for openly exposed metal surfaces to dry

Experimental determination of duration of wetness on metal surfaces

Corrosion protection assessment of sacrificial coating systems as a function of exposure time in a marine environment

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