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Stopping Rust in Bolted Systems

Dangle Rope Access • 23 November 2022
Stopping Rust in Bolted Systems

Corrosion Potential

Alloy Bolts

The fate of a complex steel assembly may be determined by the vulnerability of its smallest and least considered components. The bolts or fasteners holding the assembly together are often the areas where corrosion starts first, and where the effects of corrosion potential may have the most serious consequences.


Although the use of alloy bolts would make a big difference, the vast majority of bolts used in the offshore industry and elsewhere are carbon steel. With some bolts failing in as little as six months and the design lifetimes of industrial infrastructure being regularly exceeded, a remedy is required that can improve on the often short-lived results achieved using standard coating systems.


Bolt Corrosion Mechanisms: Why do bolts rust so easily?

If we look closely at steel bolted systems, we find large components assembled and secured using relatively small nuts and bolts. Such assemblies are found on pipelines, machinery and other infrastructures in every corner of the globe. Wherever they are found—in the joins and most particularly in the bolts—is where the greatest corrosion effects are to be found.


Differences in corrosion potential, relative size, mixed materials, damage to coatings during assembly, and crevices formed between components are all well-understood factors affecting bolt corrosion, but these are often ignored in practice.


Corrosion in a low-alloy flange is apparent where coating damage has occurred, but more significant, is the level of corrosion within bolts. Here we have two key factors operating:


  1. Relative size
  2. Corrosion potential


The bolts are of low-alloy steel with a corrosion potential of around 0.85. The flange is high-alloy with a corrosion potential of around 0.5—a difference of 0.35, well outside acceptable differences. In addition, the bolts and nuts are small relative to the structure to which they are joined, exacerbating the corrosion effect. In some environments, such bolts may show significant corrosion within weeks of installation, as they are affected in the same way as the sacrificial anodes in a cathodic protection (CP) system.


Bolt Damage and Crevice Corrosion

In nuts and bolts, assembly can cause damage and penetration of the coating, which can lead to corrosion. Nuts after only 18 months in the splash zone, its polytetrafluoroethylene (PTFE) and zinc plating failing within six weeks of exposure.

In a salt-spray test, a zinc/nickel coating would be expected to last at least 1,000 hours before "red rust" occurs. An accelerated weathering  test such as this is designed to demonstrate the potential longevity of a coating system on the basis that test conditions are extreme. For example, if it could last 1,000 hours in a salt-spray cabinet, then the lifetime of the coating should be 10 years under normal conditions.

However, 1,000 hours is only six weeks. In the real world, the bolts have been exposed to constant salt-spray conditions for 18 months, within a structure design life of 20 years.


Crevice corrosion under washers and bolt heads, and disbonded coatings on the threads, also play a role in the litany of problems affecting bolted systems.

In a report on bolt failures as part of a testing program by Det Norske Veritas (DNV), it was shown that washers are more likely to fail than any other component in a bolted system. It is easy to see why this might be true, because washers are the smallest component, trapped in a crevice, subjected to turning forces from both sides, and rarely treated with any care.


What remedies are available? Essentially, three standard remedies exist for corrosion occurring in a bolted assembly:


  1. Do nothing – Rusting infrastructure around the world is a tribute to the philosophy of putting off until tomorrow that which you should be doing today.
  2. Take everything apart, clean, recoat, replace and reassemble – Not really practical if an entire LPG carrier, offshore platform or refinery needs refurbishment every 18 months.
  3. Clean/blast/recoat the worst affected areas on a routine basis – Common practice but, once corrosion is in a system, rarely completely successful.


Corrosion-Inhibiting Sprayable Thermoplastics (CIST)

Corrosion-inhibiting sprayable thermoplastics (CIST) technologies provide a new approach to corrosion control in bolted systems, treating the entire system rather than focusing on any particular part. The system works by excluding corrosion factors such as oxygen and water through an encapsulating barrier coating. It also provides active corrosion protection through the slow release of corrosion-inhibiting oils over the lifetime of the system.


Spray-applied CIST is a zero-VOC (volatile organic compounds) reusable thermoplastic material that can be sprayed onto any substrate size or shape. The system employs a dedicated heating and pumping unit to melt and spray the material, yielding a snug-fitting coating of material that encapsulates the substrate, following every contour. The main functions of the system include the exclusion of electrolyte (water) and oxygen, and the surface coating of inhibiting oil.


By providing a vector for a film of oil to every surface within the encapsulation, CIST both prevents new corrosion and arrests existing corrosion. Very little surface preparation is required, even on rusty surfaces. Only the removal of loose materials, such as flaking rust and paint, is required.


Field Testing in the North Sea

CIST has been successfully applied since 2003 in the North Sea for protection of prematurely rusting bolts. Severe corrosion was experienced in systems that had been expected to last many years using PTFE-coated, zinc-plated, low-alloy bolts. Bolt replacement was the only obvious remedy. Realising that this would be both disruptive and expensive, the operators sought alternatives. CIST was selected due to its ability to arrest and prevent corrosion with minimal intervention and surface preparation requirements.


A regular program of removal and inspection was implemented with impressive results where a mixed metal substrate is shown to have no corrosion after seven years of exposure. The seven-year results on inspection included:


  • No evidence of new corrosion following encapsulation of previously corroded substrates
  • No evidence of galvanic effects or crevice corrosion in protected substrates
  • Coating integrity maintained despite heavy contamination
  • Inhibiting oil continued to be released after seven years


These operators continue to use CIST across the platform and have not needed to replace any bolts for corrosion failure since the application of CIST.


Field Testing at National Grid Gas Terminal

As a major operator of gas transport pipelines, the UK National Grid needed evidence of CIST performance before recommending its use. Accordingly, in 2005, a series of applications were completed for long-term testing purposes. Removal of CIST and inspections were completed in 2006, 2007, 2009 and finally in 2010 after five years. The five-year results on inspection included:


  • No evidence of corrosion was found on any of the CIST-protected substrates
  • Inhibiting oil was found to be on every surface within encapsulations
  • Although exteriors surfaces were soiled from atmospheric and industrial deposits, the coating remained in good condition with continuing oil deposition on the substrate


Following testing, a preliminary CIST installation on the Bacton interconnector site was completed in 2011, and CIST is now in use on National Grid substations at various sites in the UK, protecting gas-insulated switchgear for the National Grid and other utility companies.


Laboratory Testing

A number of tests have been completed to establish the satisfactory performance of CIST coatings under various conditions, including UV, cryogenic and ignition testing. However, for the purposes of this paper, the focus is on anti-corrosion performance; for this reason, two tests are highlighted here.


1. Salt Water Deluge Testing: The susceptibility of low-alloy steel assemblies to the corrosion effects of salt water is well documented. In this test, a carbon steel pipe and flange is subject to a constant flow from a 20% saline mixture for five days a week for periods up to six months at 86°F (30°C). The flange is protected with CIST, but the pipe remains unprotected. After six months, the constant cycle of salt water and drying has corroded the unprotected pipe. However, under the CIST system, the substrate remains completely clear of corrosion. The saltwater deluge testing results included:


  • No ingress of water through the upper seal onto the pipe
  • Corrosion occurred on unprotected pipe
  • No corrosion within CIST encapsulation
  • Coating was unaffected by immersion cycles


2. Hot Salt Fog Testing: An international company considering CIST for wellhead protection subjected a small wellhead section to brutal salt  fog testing in a hot salt fog chamber. The substrate was coated with CIST and then large sections of the coating were cut away before the test piece was subjected to a 3,000-hour test in the chamber.


Independently observed testing by the original developers of CIST showed zero corrosion after more than 10,000 hours in a hot-salt fog chamber—nearly 14 months!


Results of the developer's hot salt fog tests included:


  • Exposed cutaway areas showed severe signs of rust
  • CIST-protected areas show no sign of corrosion
  • Severe damage to coating did not affect the ability to protect adjacent areas
  • Corroded nuts were difficult to turn and remove; impossible to check bolt tension
  • Protected nuts rotated freely; bolt tension was unaffected


Traditionally, the application of remedial coatings to corroded bolted steel assemblies required high levels of intervention—disassembly, replacement, blasting and coating—with the expectation that corrosion would reappear relatively quickly.

An effective long-term remedy has an important role to play in infrastructure protection and the reduction of risk to personnel and the environment. Early field use of this new technology shows promise in solving some of these challenges.


  • Testing and field applications since 2004 have demonstrated that CIST can provide long-term protection against galvanic corrosion and crevice corrosion.
  • CIST provides bolt corrosion control on existing and new-build applications without the need for large-scale intervention.
  • CIST corrosion prevention mechanisms provide whole system as well as individual component protection in complex assemblies.
  • Non-toxic, reusable and waste-free, CIST helps reduce the environmental impact of corrosion prevention.


In industrial, marine and offshore environments, with equipment life cycles being extended and safety guidelines more stringently applied, corrosion prevention has become increasingly important.


About Dangle Rope Access


Here at Dangle Rope Access, we provide a variety of comprehensive inspection, access, coatings, and composite (IACC) industrial services. Our services are available to both the private and public sectors.


We offer high-quality proven solutions that will help reduce maintenance costs in both the long and short-term. We are based in Dundee, Scotland and also have offices based in Edinburgh, along with our newly established training centre in Northern Ireland Dangle Academy. Due to our company size and structure, we are able to offer a flexible and versatile approach to the way we run our business and the services that we offer our clients. And, as a leading painting company, we’ve worked on several renewable energy projects in the UK, Europe, and the US. 



We work with both on and offshore with wind farm operators, and asset owners. For offshore wind farm maintenance, to onshore building maintenance, we can cover both the East and West coasts. 


To find out more about how our team can help you contact us today. Our friendly, professional and helpful team is always on hand to help.





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Furthermore, the advent of smart equipment is transforming the way industrial abseilers approach their work. Sensor-equipped harnesses and ropes can provide real-time data on equipment stress and environmental conditions, enabling more informed decision-making during operations. These technological advancements are not only improving safety standards but also increasing the efficiency and precision of industrial abseiling tasks. As the industry continues to evolve, it is anticipated that these innovations will become increasingly prevalent, shaping the future landscape of industrial abseiling and setting new benchmarks for safety and performance. Crucial Role of Industrial Abseiling in Infrastructure Maintenance In conclusion, industrial abseiling plays a pivotal role in the maintenance of modern infrastructure, particularly in the realm of renewable energy. As the United Kingdom strives to achieve its ambitious target of 40GW offshore energy production by 2030 , the importance of efficient and cost-effective maintenance techniques cannot be overstated. Wind turbines, a cornerstone of this renewable energy initiative, require regular inspection and upkeep to ensure optimal performance and longevity. Industrial abseiling offers a unique solution to the challenges posed by these towering structures, allowing skilled technicians to access hard-to-reach areas with minimal disruption to operations. This method not only facilitates thorough maintenance but also contributes to the overall efficiency of wind farms, thereby supporting the nation's net carbon zero reduction goals. As we progress towards a more sustainable future, the significance of industrial abseiling in maintaining our renewable energy infrastructure will only continue to grow. It is imperative that industry stakeholders recognise and invest in this crucial skill set to ensure the longevity and effectiveness of our renewable energy assets, ultimately supporting the UK's transition to a greener, more sustainable energy landscape. About Dangle Rope Access Here at Dangle Rope Access, we provide a variety of comprehensive inspection , access , coatings , and composite (IACC) industrial services. Our services are available to both the private and public sectors. We offer high-quality proven solutions that will help reduce maintenance costs in both the long and short-term. We are based in Dundee, Scotland and also have offices based in Edinburgh, along with our newly established training centre in Northern Ireland Dangle Academy . Due to our company size and structure, we are able to offer a flexible and versatile approach to the way we run our business and the services that we offer our clients. And, as a leading painting company, we’ve worked on several renewable energy projects in the UK, Europe, and the US. We work with both on and offshore with wind farm operators, and asset owners. For offshore wind farm maintenance, to onshore building maintenance, we can cover both the East and West coasts. To find out more about how our team can help you contact us today. Our friendly, professional and helpful team is always on hand to help!
An old rusty ship in the middle of the ocean
by Dangle Rope Access 4 May 2024
Discover the leading painting companies in your local area. Our experienced team delivers high-quality results tailored to your needs. Contact Dangle today!
A man wearing a helmet and gloves is sandblasting a piece of metal.
by Dangle Rope Access 18 April 2024
Everything you need to know on the market-leading industrial painting course iCats. Check out learning paths, options & curriculum. Read to learn more
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