Corrosion / Weathering

Corrosion and weathering are both major contributors to overall costs. Globally around 5 tonnes of steel are lost every second due to corrosion. Causing huge global costs and a significant influence on environmental conditions. Around 30% of this staggering €17.5 billion price tag can be prevented by basic corrosion testing. Not only the impact of corrosion on the environment is essential also it’s influence on insurance costs and installation off time’s.
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Corrosion and weathering are both major contributors to overall costs. Globally around 5 tonnes of steel are lost every second due to corrosion. Causing huge global costs and a significant influence on environmental conditions. Around 30% of this staggering €17.5 billion price tag can be prevented by basic corrosion testing. Not only the impact of corrosion on the environment is essential also its influence on insurance costs and installation off times.

Corrosion and weathering
Corrosion and weathering have both separate causes of weather influences. Where corrosion often refers to the degradation of the metal substrate or the delaminating of the paint weathering usually is about the degradation of the coating film.

Corrosion is mainly the product of humidity, an oxidizing agent and an accelerator. This accelerator can be one of many things, examples are aggressive ions like Chlorides and sulphates, but also electrical currents, are a significant influence. The many form of corrosion all have their own background and origin. Examples of corrosion forms are uniform, stress, pitting, bimetal corrosion.

Weathering is caused by different factors, and has a milder effect on structural strength but a high effect on visual performance. A sports car that is only shiny for the first month and then loosing its gloss and colour due to weathering; UV lights; leaching of pigments and destabilization by temperature are only some examples. Weathering is manifested by creating visual defects on the surface. Degradation of binders and pigments are the main problem. When a binder degrades, often smaller pigment starts to leach out. This will cause paint to loose its colour and gloss.

Types of corrosion tests
When performing a corrosion test there is a choice of multiple types of test. Neutral environments to acidic acid, UV lighted or Cupper accelerated corrosion tests, and continuous or cyclic tests. In order to select the right test it is important to realize what type of corrosion or weathering you are trying to simulate. Industrial and national standards are often the biggest resource in the maze of corrosion test standards.
Standards News FAQ Links

KNOCK-OUT TESTPANELS

Our new TQC Knock-out testpanels are designed to minimize the build-up of paint on the panel edges because of de knock-out frames. Also because of the 4 mm holes in the knock-out frames it is easy to hang the panels horizontally or ...

MACHU SCRATCHING TOOL

TQC Machu Scratching Tool to perform a Machu test (corrosion test) with. Each tool is provided with a 1mm width cutter to cut the coating down to the metal, complying with ISO 17872. Two models are available: The TQC Machu Scratchi...

MACHU TEST BATH

TQC Machu test, accelerated corrosion test on test panels and construction parts according to Qualicoat specifications. The test is made in a warm environment. To create this environment the test panels are placed in the plastic co...

MULTIMETER FOR ACCELERATED WEATHERING CABINETS

Digital multimeter for measuring the radiation and "black body" temperature in accelerated weathering cabinets. Ideal for validating accelerated weathering cabinets.

SOLARBOX ACCELERATED WEATHERING CABINET

Test cabinets for the accelerated testing of products such as coatings, plastics, packaging etc. on wear and tear caused by light and/or temperature. A powerful Xenon light source produces radiation on different wavelengths and, if ...

STUDY BOOK CORROSION HANDBOOK

This study book about corrosion testing gives trained and untrained users further insight in the required techniques for corrosion testing. Corrosion principles just as possible interferences in and around the cabinet are discussed....