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What Is Hydrogen-Induced Cracking (HIC)? - Definition From

Hydrogen-induced cracking (HIC) refers to the internal cracks brought about by material trapped in budding hydrogen atoms. It involves atomic hydrogen, which is the smallest atom, that diffuses into a metallic structure.

Actived: Tuesday Sep 29, 2020

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The use of cathodic protection coupons for monitoring

Two wires coupons. Coupons with a built-in integral reference electrode. As an option a flexible conduit can extend above grade for irrigation purpose in case of dry conditions. Coupons with a stationary electrode permanently buried near the coupon. Dual coupons with the same geometry and size for measuring both CP and rest potentials.

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What is Instant-Off Potential? - Definition from

The instant-off potential measurement corrects these errors. The CP current is momentarily stopped to produce a "true" pipe-to-soil potential, which is free from undesirable IR drop effects and taken before any appreciable depolarization has occurred. When the CP current is turned off, the current lowers to zero (I=0 amps) and causes the IR drop.

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What is a Pull-off Strength? - Definition from Corrosionpedia

The pull-off strength is the result of this test based on the force used in pulling, the type of adhesive used with the dolly and the type of failure on the coating surface. The pull-off strength of a coating is an important factor to consider when selecting an appropriate coating to protect surfaces made of metal, plastic, wood, concrete and

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What is Flash-Off Time? - Definition from Corrosionpedia

Flash-off time is the necessary waiting time taken to recoat or spray once a first coat is applied on a material. If the wait time is very long, it needs to be scuffed; if the flash-off time is short, irregularities in the paint job can be expected. Generally, a minimum flash off-time is 20 minutes at atmospheric temperatures.

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Corrosionpedia - What is a Pencil-type Pull-off Gauge

A pencil-type pull-off gauge consists of a permanent magnet, a calibrated spring and a graduated scale. The attraction between the magnet and the steel pulls the two objects together. As the coating thickness that separates the two increases, it becomes easier to pull the magnet away.

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What is a Pull-off Adhesion Test? - Definition from

A pull-off adhesion test is a standard industrial practice governed by ASTM D 4541 that is used to assess the durability of protective coatings and determine if the coating application is adequate for service.

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What is a Stand-Off Distance? - Definition from Corrosionpedia

A stand-off distance is used to establish a fixed protocol for blast cleaning. It is a measurement used when applying air, water, chemicals or other fluids to remove or dissolve unwanted material buildup on an object. Left uncleaned, this buildup typically promotes crevice corrosion and other forms of metal degradation.

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4 Types of Tests that Measure the Strength of a Coating

Ensuring the integrity of a protective coating is absolutely critical when designing, applying and monitoring the coating. There is a severe risk of coating failure if one does not know what a coating is capable of withstanding. Testing the mechanical properties of a coating is one of the best ways to ensure that the coating in question can handle the environmental and operational conditions

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Practical Techniques for Cathodic Protection Potential

3. External CP Coupons. CP coupons are intended to simulate a small portion of a well-coated pipeline like a holiday; they are manufactured from the same alloy as the protected structure, and they are typically 10 to 100 cm² in surface area.. CP coupons should be buried near the protected structure in the same electrolyte, subjected to the same CP current and connected electrically to the

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Coatings for Marine Applications & Offshore Platforms

While offering new anticorrosion coatings for marine and offshore applications, manufacturers are under consistent pressure due to stricter environmental regulations, as well as the simultaneous demand to provide long-term, cost-effective protection of assets from corrosion.. These newly developed coatings, which meet the stringent regulatory norms, can also prove to be effective and

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