Sep 14, 2012
Maintenance needed to reduce wire, sling and chain corrosionBack
Engineering|Africa|Aluminium|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
To eliminate the possibility of chemicals powders cross contaminating and subsequently corroding its supplies, chemicals, plastics, packaging materials and mining and construction products distributor The CHC Group South Africa (SA) recently installed precast...
Updated 12 minutes ago A challenging construction sector, difficult contractual environment and poor operational performance have contributed to JSE-listed construction company Basil Read reporting an R820.9-million aftertax loss for the year ended December 31, 2014. “Lossmaking contracts...
Updated 55 minutes ago Big cities across the world struggle with crime, and Zimbabwe’s Harare is no exception. Naison Gumpo, a journalism student studying in the capital, knows this only too well.
Updated 56 minutes ago There is a high possibility of rolling blackouts on Friday, Eskom said on its Twitter account. "The load shedding prognosis today [Friday] remains high and is dependent on the performance of the power plant," the power utility tweeted.
Recent Research Reports
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
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...
This Week's Magazine
Projected capital expenditure (capex) in the South African automotive assembly industry should reach a record R7.48-billion this year, says the National Association of Automobile Manufacturers of South Africa (Naamsa) in its 2014 fourth quarter business review. Capex...
After several years of navigating project-threatening red tape and currency fluctuations, the 4.4 MW Bronkhorstspruit biogas power plant, which will supply clean energy to a leading automotive manufacturer in Gauteng, is expected to enter production before June....
South African paper and pulp producer Sappi reported earlier this month that it would build a pilot plant for the production of low-cost Cellulose NanoFibrils, or CNF (nanocellulose) at the Brightlands Chemelot Campus in Sittard-Geleen in the Netherlands.
The long-term outlook for Nigeria is a country that has the potential to be very strong. So affirmed International Monetary Fund (IMF) Nigeria Mission Chief and Senior Resident Representative Dr Gene Leon on recently. "But we are starting from a point of huge...
Poor infrastructure planning and inadequate maintenance are becoming increasingly problematic for new developments and the associated infrastructure required to support such developments.