Archive for September, 2006
Galvanised Steel – How to Prepare for Painting
Background There are many instances where hot dip galvanised coatings need to be painted. There are well established quality assurance procedures for the painting of hot dip galvanised components in a controlled environment, but it is a common requirement to apply paint coatings to hot dip galvanising on site. Surface Condition When a steel item [...]
Read Full Post | Make a Comment ( None so far )Galvanised Steel – How to Prepare Structural Steel for Painting
Background There is an increasing use of painted structural galvanised steel as specifiers seek longer-life solutions for steel structures or architectural requirements demand colour as designers use the flexibility of steel as a feature in architectural design of major structures.The performance of painted galvanised steel is well established, and the synergy that exists between a [...]
Read Full Post | Make a Comment ( None so far )Galvanised Steel – Underground Corrosion
Background Buried steel items are subjected to a range of corrosive forces quite unlike those experienced in atmospheric exposure conditions, and the performance of both steel and galvanized steel in-ground is not as well understood as is the durability of these materials in above-ground applications.Considerable research into the management of underground corrosion has been done, [...]
Read Full Post | Make a Comment ( None so far )Galvanised Steel – Galvanic Corrosion of Galvanised Steel
While hot dip galvanized coatings provide envelope protection for steel, the zinc in the coating will also protect the steel cathodically if the coating is damaged and the bare steel exposed.The rate of consumption of the galvanized coating will depend on the size of the cathode (the bare steel) and the size of the anode [...]
Read Full Post | Make a Comment ( None so far )Galvanised Steel With a Powder Coated Surface
Background One of the most durable protective coatings for steel is provided by applying a polyester powder coating over hot dip galvanised steel to provide a high grade architectural finish to steel items. What Are Powder Coatings? Polyester powders are thermosetting resins that are applied electrostatically to the steel surface and stoved at temperatures around [...]
Read Full Post | Make a Comment ( None so far )Galvanising – Electrochemical Protection for Steel
Background The derivation of the term ‘galvanising’ has absolutely nothing to do with protecting steel from corrosion. The name comes from the Italian physiologist, Luigi Galvani, who identified the effects of electric current on the nervous system of dead frogs. In the formative years of electrical science, zinc was the most widely used metal for [...]
Read Full Post | Make a Comment ( None so far )Galvanising – Grey Coatings on Hot Dipped Steel
Background A common phenomenon with hot dip galvanised structural steel is the grey appearance of part or all of the coating after galvanising, where the expectation of the customer is for the galvanised steel to be shiny. Grey coatings are often a cause of contention between galvanisers and their customers as a result. This document [...]
Read Full Post | Make a Comment ( None so far )Galvanising – The Effects of Coating Thickness
Background There are many types of coatings that are specified as hot dip galvanised. The process involves immersing steel in molten zinc. The zinc reacts with the steel to form the galvanised coatings. The time the steel is immersed in the zinc along with post-galvanizing treatment controls the coating thickness, appearance and other characteristics.Hot dip [...]
Read Full Post | Make a Comment ( None so far )Galvanising – Reliability Factors for Hot Dip Galvanising and Paint
Background There are two types of coating failure; predictable and unpredictable. All coatings are designed to provide a certain level of performance in a specified environment. If failure occurs prematurely, something has gone wrong!If failure occurs, it is generally the result of a problem associated with the selection or application of the coating. It is [...]
Read Full Post | Make a Comment ( None so far )Galvanising – Venting and Draining Design Guide
Background One of the most common issues in designing fabrications for hot dip galvanizing is ensuring that fabrications are vented and drained correctly. All steel to be galvanised needs to be immersed in molten zinc and the zinc needs to be able to flow freely into and out of all hollow sections and corners.The flow [...]
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