Best Cathodic Protection in India

Introduction

Cathodic protection to buildings is one of the most effective methods used for preventing corrosion on a metal surface. Cathodic protection is commonly used to protect large structures against corrosion, examples include things such as ships, offshore floaters, submerged equipment, harbours, pipelines, tanks; basically, all submerged or buried metal structures. Where structures are surrounded by corrosive electrolytes, cathodic protection has a proven track record in mitigating the natural effect of the environment on critical and highly valued structures.

Problem / What is at stake?

Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration in concrete. When steel corrodes, the resulting rust occupies a greater volume than the steel. This expansion creates tensile stresses in the concrete, which can eventually cause cracking, delamination, and spalling.

Steel, like most metals except gold and platinum, is thermodynamically unstable under normal atmospheric conditions and will release energy and revert back to its natural state—iron oxide, or rust. This process is called corrosion.

For corrosion to occur, these elements must be present:

• There must be at least two metals (or two locations on a single metal) at different energy levels
• an electrolyte
• a metallic connection

In reinforced concrete, the rebar may have many separate areas at different energy levels. Concrete acts as the electrolyte and the metallic connection are provided by wire ties, chair supports, or the rebar itself.

Corrosion is an electrochemical process involving the flow of charges (electrons and ions). At active sites on the bar, called anodes, iron atoms lose electrons and move into the surrounding concrete as ferrous ions. This process is called a half-cell oxidation reaction, or the anodic reaction.

Corrosion is an electrochemical process involving the flow of charges (electrons and ions). At active sites on the bar, called anodes, iron atoms lose electrons and move into the surrounding concrete as ferrous ions. This process is called a half-cell oxidation reaction, or the anodic reaction.

Corrosion of embedded metals in concrete can be greatly reduced by placing crack-free concrete with low permeability and sufficient concrete cover. Low-permeability concrete can be attained by decreasing the water to cementitious materials ratio of the concrete and the use of pozzolans and slag. Pozzolans and slag also increase the concrete resistivity thus reducing the corrosion rate even after it initiates. All the Civil Engineering Codes provide minimum concrete cover requirements that will help protect the embedded metals from corrosive materials. Additional measures to mitigate corrosion of steel reinforcement in concrete include the use of corrosion inhibiting admixtures, coating of reinforcement (for example, with an epoxy resin), and use of sealers and membranes on the concrete surface. Sealers and membranes, if used, have to be periodically reapplied.

Typical Problem Areas

• Regulatory requirements for the external protection of oil and gas pipelines
• Corrosion on submerged piling
• Corrosion of reinforcement in concrete structures
• Above and below ground liquid storage tanks
• Ship hulls
• Wharf and jetty piling

Our Expertise / How SSPIPL can help you?

As a market leader in the provision of cathodic protection services in India, SSPIPL can provide all aspects of cathodic protection design and operation assistance. We can help with design and installation and monitoring of catholically protected structures.

SSPIPL provides Cathodic Protection to Buildings which include:

• Auditing of existing stage of corrosion
• Design and installation of anodic protection systems
• Sacrificial anode systems
• Impressed current systems
• Maintenance & monitoring of cathodic protection systems

Protection from corrosion is a commercial, safety and environmental issue. Our expertise in the selection and application of protective coating systems will significantly enhance your asset’s operational performance and working lifespan.

SSPIPL has worked with several well-known names such as Tata Motors, Bennett Coleman and Co. Ltd. (Times of India), Siemens Limited, Goa State Infrastructure Development Corporation, Sterlite Technologies Limited, Bombay Hospital Trust, Uttar Pradesh Rajkiya Nirman Nigam Limited, Tata Motors Limited, Watson Pharma, Lubrizol India Private limited, Nagpur Improvement Trust, Mumbai Port Trust, Axis Bank, Consulate General of the federal republic of Germany Mumbai, Peninsula Land Limited, ACC Limited (ACC Cement), Larsen and Toubro and many others.

SSPIPL is a leading specialist contractor that has undertaken & successfully completed major projects in all major cities of India. SSPIPL can cater to cities like Mumbai, Delhi, Kolkata, Bangalore, Hyderabad, Chennai, Bhopal, Bhubaneswar, Chhattisgarh, Raipur, Gandhinagar, Lucknow, Patna, Ranchi, Gangtok, Dehradun, Chandigarh, Shimla & Srinagar.