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Corrosion Attack Mechanisms on Glasses

The corrosion attack mechanisms on glasses and glazes can vary greatly depending on the pH; and also strength of the attacking medium as well as other factors.

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Hybrid Powder Coatings

Hybrid coatings share many characteristics with standard epoxy-based powder coatings.

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Factors that influencing Corrosion Reactions

In any discussion of the mechanism of a chemical reaction, it is advisable to separate the factors which determine the tendency or driving force of the reaction to proceed from those which influence the rate of the reaction made possible by the existence of this tendency.

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Pitting Corrosion Diagrams for Stainless Steels

Stainless steels can be prone to various different types of corrosion, dependent on the combination of alloy composition and operating environment. In service situations the localized corrosion mechanism most commonly encountered is almost certainly pitting corrosion.

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Types of corrosion in aircraft

Intergranular Corrosion can be caused by poor processing during manufacture of the alloy. Usually it is caused by selecting the wrong chemical in attempting a conversion coating on a given alloy. It also can be caused by poor control of heat treatment processing.

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Atmospheric Corrosion and Corrosion Monitoring

Atmospheric corrosion and its severity is essentially determined by four variables:

  • Air pollution
  • Airborne salt spray or droplets
  • Temperature
  • Moisture
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Corrosion Resistant Materials, suited for working around salt water

There are three types of materials; steel, aluminum and plastics, that are ideally suited for working around salt water.

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Corrosion mechanism and Corrosion control of metals in saltwater environments

The fundamental of corrosion lies in the flow of electricity between certain areas of a metal surface through a solution (i.e. environment) capable of conducting an electric current. This electrochemical action causes destructive alteration or eating away of a metal at areas which are called anodes, where the electric current leaves the metal and enters the environment to which it is exposed.

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Concept Map of electrochemical corrosion

When electrons from atoms at the surface of the metal are transferred to a suitable electron acceptor or depolarizer, then the electrochemical corrosion of metals occurs . Water must be present to serve as a medium for the transport of ions.

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Good reasons to use Plastic Ball Bearings
  • Corrosion resistance, Lightweight, Design flexibility, Product integration
  • Shock load suppression, Lubrication free, Low inertia freer turning
  • Non metallic non magnetic, Hygienic, Noise control
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Corrosion Resistant Plastics

Corrosion resistant plastics are comprised of two groups:

  • Polyolefins group
  • Polyvinyl chloride group
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Inspection or monitoring through paint

The concept of inspection or monitoring through paint for informed decision-making is gaining momentum (considering potentially costly and environmentally harmful removal and replacement of coating systems).

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Avoiding Paint Failures

To avoidg paint failures, following have been identified as important elements:
Selection of suitable paint system; correct surface preparation; correct application;correct drying, curing and overcoating times;protection against water.

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Microbiological Influenced Corrosion of stainless Steel in Municipal Waste Water Treatment Plants

The area near welds and welds in the standard grades of stainless steels are occasionally subject to microbiological influenced corrosion (MIC) in stagnant and slowly moving waters.

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Quantitative Electrochemical Corrosion Theory

Icorr cannot be measured directly.  In many cases, it can be estimated from current versus voltage data.

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