File:Corrosion of Duralumin.jpg
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Summary
DescriptionCorrosion of Duralumin.jpg |
Eesti: Korrosioon ehk materjalide hävimine keskkonnamõjude toimel on nii tavainimese kui ka paljude ettevõtete igapäevane probleem. Selle nähtuse eest ei ole kaitstud elektriseadmed, ehted, nutitelefonid, sülearvutid, autod, lennukid ega ka hambaimplantaadid. Üsna tõsine on korrosiooniprobleem just duralumiiniumi korral, mis on tänu oma kergusele ning suurepärastele mehaanilistele omadustele kasutusel just lennukite valmistamises. Erinevalt puhtast alumiiniumist on aga see sulam ülimalt tundlik korrosiooni suhtes ning aja jooksul moodustuvad punktkorrosiooni toimel sügavale materjali sisemusse ulatuvad „koobastikud“, mis võivad viia koormuse all oleva detaili ootamatu purunemiseni. Kui kirjeldatud juhul oleks tegu lennukidetailiga, siis oleks juba ohustatud ka inimelud! Pildil on kujutatud duralumiiniumi pind peale lühiajalist leotamist soolases vees. Nagu pildil näha, ongi juba sulamisse moodustunud palju sügavaid mikroskoopilisi auke, mis ümbritsevad keskel olevat heledamat ala. Kuigi see hele ala on korrosiooni poolt vähem kahjustatud, on temal oluline roll duralumiiniumi hävimisel – nimelt kiirendab ta elektrokeemiliselt kogu ümbritseva sulami korrodeerumist! Korrosioonimehhanismid on sageli väga keerulised ja sõltuvad nii materjalist, selle töötlusest kui ka kasutuskeskkonnast ning seetõttu tegelevadki Tartu Ülikooli kiletehnoloogia labori materjaliteadlased uudsete korrosiooniennetusmeetodite väljatöötamise ning ka ettevõtete korrosioonialase nõustamisega. Paljude probleemide jaoks on sageli sobivad korrosiooniennetusmeetodid juba olemas kuid parima leidmiseks on vaja läbi viia täiendavad mikroskoopia uuringud. Näiteks on antud ülimalt informatiivne pilt tehtud võimsa optilise mikroskoobiga Nikon Eclipse LV150. English: Corrosion is the degradation of a material due to the environment and it affects our daily life. While in some cases the problem is only aesthetic (dulling of jewelery), the corrosion of duralumin can lead to disasters as this material is often used in the construction of airplane parts. The image of duralumin is taken after a short immersion in salt water, revealing deep pits reaching into the depths of the material. The black spots are corrosion marks. The bright area in the center is not a hole, but a less affected area that accelerates the electrochemical corrosion of the remainder. Such deep tunnels however may lead to the materials unexpected failure and therefore correct corrosion prevention methods need to be applied. English: Corrosion of Duralumin |
Date | |
Source | Own work |
Author | Maido Merisalu |
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This image was uploaded as part of European Science Photo Competition 2015. |
some value
11 November 2015
image/jpeg
6af1cf939afbe7b99cb76a2c97d5aeab05834040
3,311,387 byte
1,844 pixel
2,552 pixel
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Date/Time | Dimensions | User | Comment | |
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current | 08:41, 11 November 2015 | 2,552 × 1,844 (3.16 MB) | Maido Merisalu | User created page with UploadWizard |
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Camera manufacturer | Nikon |
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Camera model | DS-Fi1-L2 |
Exposure time | 1/180 sec (0.0055555555555556) |
Width | 2,560 px |
Height | 1,920 px |
Bits per component |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Number of rows per strip | 1 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | 450 .1032.3220.100531 |
File change date and time | 16:34, 11 November 2015 |
Exposure Program | Normal program |
Exif version | 0.2 |
Metering mode | Average |
Unique image ID | E99BE5BACC9D47768F38D87D84F5BC88 |
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