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Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels. / Khalil Khan

Swansea University Author: Khalil Khan

Abstract

Investigations were carried out to assess the role of primer, pretreatments and coating microstructure in preventing cutedge corrosion of chrome free organically coated steels. Zinc runoff was monitored from a range of organically coated steels with a large cutedge length exposed over 18 months at S...

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Published: 2012
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42264
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first_indexed 2018-08-02T18:54:17Z
last_indexed 2018-08-03T10:09:41Z
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spelling 2018-08-02T16:24:28.6201867 v2 42264 2018-08-02 Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels. 009e1107e34346a7d76504253d1fff2f NULL Khalil Khan Khalil Khan true true 2018-08-02 Investigations were carried out to assess the role of primer, pretreatments and coating microstructure in preventing cutedge corrosion of chrome free organically coated steels. Zinc runoff was monitored from a range of organically coated steels with a large cutedge length exposed over 18 months at Swansea University roof top site. The zinc in the runoff leaches from the zinc-aluminium alloy coating of the substrate. The paint systems' corrosion performance was assessed by monitoring the levels of zinc in the runoff. Consequently the levels of zinc reflected the effectiveness of the applied paint system against corrosion. Runoff was high in initial months with zinc levels reducing with time due to the build up of corrosion products that hindered the progress of corrosion. An accelerated laboratory test using a distilled water electrolyte was developed that predict long-term external weathering runoff from panels of a range of organically coated steels. The corrosion mechanisms of a variety of organically coated Galvalloy steel have been examined using the scanning vibrating electrode technique (SVET) in 0.1%NaCI. The corrosion behaviour of a coating is related to the zinc-aluminium alloy coating structure and combination of pretreatment and primer. The SVET has been used to assess total zinc loss and the corrosion rate for a comparative measure of organically coating system performance. A correlation has been developed from SVET 24hour experiment data to accelerated weathering data and external weather data that can aid more accurately predicting the in service life of the product. Also considered were the effects of electrolyte conductivity on the morphology of corrosion on pure zinc. A mathematical model has been developed to predict corrosion pit population. Altered microstructure of solidifying zinc aluminium alloy melt via ultrasonication was investigated. Ultrasound irradiation significantly altered the final microstructure. The influence of morphed microstructure upon the corrosion behaviour was explored using the SVET in 0.1%NaCI. The ultrasound manipulated microstructure had generally a positive effect on the corrosion behaviour. E-Thesis Materials science. 31 12 2012 2012-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:28.6201867 2018-08-02T16:24:28.6201867 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Khalil Khan NULL 1 0042264-02082018162440.pdf 10797972.pdf 2018-08-02T16:24:40.8370000 Output 14570419 application/pdf E-Thesis true 2018-08-02T16:24:40.8370000 false
title Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
spellingShingle Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
Khalil Khan
title_short Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
title_full Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
title_fullStr Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
title_full_unstemmed Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
title_sort Investigation into the role of primer, pre-treatments and coating microstructure in preventing cut edge corrosion of organically coated steels.
author_id_str_mv 009e1107e34346a7d76504253d1fff2f
author_id_fullname_str_mv 009e1107e34346a7d76504253d1fff2f_***_Khalil Khan
author Khalil Khan
author2 Khalil Khan
format E-Thesis
publishDate 2012
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Investigations were carried out to assess the role of primer, pretreatments and coating microstructure in preventing cutedge corrosion of chrome free organically coated steels. Zinc runoff was monitored from a range of organically coated steels with a large cutedge length exposed over 18 months at Swansea University roof top site. The zinc in the runoff leaches from the zinc-aluminium alloy coating of the substrate. The paint systems' corrosion performance was assessed by monitoring the levels of zinc in the runoff. Consequently the levels of zinc reflected the effectiveness of the applied paint system against corrosion. Runoff was high in initial months with zinc levels reducing with time due to the build up of corrosion products that hindered the progress of corrosion. An accelerated laboratory test using a distilled water electrolyte was developed that predict long-term external weathering runoff from panels of a range of organically coated steels. The corrosion mechanisms of a variety of organically coated Galvalloy steel have been examined using the scanning vibrating electrode technique (SVET) in 0.1%NaCI. The corrosion behaviour of a coating is related to the zinc-aluminium alloy coating structure and combination of pretreatment and primer. The SVET has been used to assess total zinc loss and the corrosion rate for a comparative measure of organically coating system performance. A correlation has been developed from SVET 24hour experiment data to accelerated weathering data and external weather data that can aid more accurately predicting the in service life of the product. Also considered were the effects of electrolyte conductivity on the morphology of corrosion on pure zinc. A mathematical model has been developed to predict corrosion pit population. Altered microstructure of solidifying zinc aluminium alloy melt via ultrasonication was investigated. Ultrasound irradiation significantly altered the final microstructure. The influence of morphed microstructure upon the corrosion behaviour was explored using the SVET in 0.1%NaCI. The ultrasound manipulated microstructure had generally a positive effect on the corrosion behaviour.
published_date 2012-12-31T03:52:37Z
_version_ 1763752602877558784
score 11.036531

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