Sep 14, 2012
Maintenance needed to reduce wire, sling and chain corrosionBack
Engineering|Africa|Pipelines|Pipes|Projects|Safety|Water|Africa|End Product|Maintenance|Metal|Pipes|Steel|Steel Wire|Henning Van Wyk|Water|Wehrner Lemmer|Pipelines|Corrosion Protection
© Reuse this
Regular maintenance checks have to be performed on these materials to ensure corrosion does not occur. It is also better to fix early-stage corrosion before it weakens the material, which is a serious concern for end-users, he notes.
Depending on the application, corrosion could jeopardise the safety, functionality or efficiency of the end product, Van Wyk states.
Corrosion occurs in the presence of moisture – for example, when iron is exposed to moist air and reacts with the oxygen to form rust. The oxide formed through oxidation does not firmly adhere to the surface of iron and that of many other metals. It flakes off easily, causing pitting, he explains.
Extensive pitting eventually causes structural weakness and disintegration of the metal.
Van Wyk adds that the industry realises the importance of preventing corrosion in wire, sling and chain, but end-users need to maintain the material and prevent corrosion, or treat it in the early stages of formation.
He states that hot-dip galvanising can be an effective corrosion protection measure.
Hot-dip galvanising entails the application of a thin zinc coating to metal by immersing the object in a bath primarily consisting of molten zinc. This protects the steel, even if the surface is scratched, Van Wyk explains.
Galvaspin adds that hot-dip galvanising is not a costly process and that it is more cost effective to protect and maintain materials than to replace a weakened area in the material.
Meanwhile, Galvaspin has been contracted by local artist Wehrner Lemmer to protect his latest art piece against corrosion, as it will be displayed outdoors.
“This was an unusual request, as we have never worked on artwork before and it was something on which the team enjoyed working,” Van Wyk tells Engineering News.
Lemmer is known for his earthy Africa-inspired work, but plans to use more colour in his art.
Van Wyk explains that Lemmer wanted a paint finish on the piece.
Galvaspin chose thermal-metal spraying as the best option to allow for the best results in this specific type of coating. The process involves spraying items with a molten metal application that includes a zinc or aluminium alloy.
“We have thermal-metal-sprayed the sculpture to protect it from corrosion; the next process is to spray it with the artist’s colour of choice.”
Both projects involve the thermal-metal spraying of pipelines, which are used in the movement of water, to prevent corrosion and leaks as well as maintain a consistent supply of water for the areas.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines (150 word limit)
Other Corrosion and Tribology News
Recent Research Reports
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
This Week's Magazine
As the City of Ekurhuleni continues its bid to develop the largely industrialised metropole into the continent’s first aerotropolis, executive mayor Mondli Gungubele has committed the city to creating a predictable, stable and enabling business environment in which...
While Ford Motor Company of Southern Africa (FMCSA) did not have “significant issues” with power supply in Gauteng, it was a different story in the Eastern Cape, said FMCSA and American Chamber of Commerce in South Africa president Jeff Nemeth earlier this month....
In 2000, exports into Africa from South Africa represented less than 5% of the turnover of Federal Mogul Motorparts Africa, with sales largely centred around Zimbabwe, Zambia, Malawi and Mozambique. Today, African exports represent 30% of sales, with trade expanded...
The Malawi government has launched a $50-million project to upgrade the Kamuzu barrage, on the Shire river, an outlet of Lake Malawi, which is used to control the flow of water from the lake to the lower Shire area. The project will run from this year to 2017 and...
Our new Technical and Vocational Education and Training (TVET) Colleges will replace the Further Education and Training (FET) Colleges which have served us for the past twenty years. The buildings will be the same and most of the staff will be the same but as the...