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Corrosion resistance

These tests are designed to evaluate how well the surface coatings protect substrates from corrosion. If you are more concerned with the effect of sunlight, moisture and temperature on the actual surface coating, please refer to our Durability tests.

The BS and ASTM standards mentioned here are copyright-protected documents and we are not able to provide you with copies. If required however, you can easily obtain copies from the British Standards Institution or the American Society for Testing and Materials.

Test Standard
Resistance to Cyclic ProhesionASTM D 5894
Resistance to Cyclic ProhesionBS 3900-F19, ISO 11997-2
Resistance to Cyclic Salt SprayBS EN 60068-2-52, IEC 68-2-52
Resistance to HumidityBS 3900-F2, BS EN ISO 6270, BS 3900-F9, ASTM D2247
Resistance to ProhesionASTM G 85-94 Annex A5
Resistance to Salt SprayBS 3900-F12, ISO 7253, BS EN ISO 9227, ASTM B 117
Resistance to Salt SprayBS 3900-F4
Resistance to Sulphur DioxideBS 3900-F8, BS EN ISO 3231, ISO 3231
Resistance to Sulphur DioxideDIN 50018

Resistance to Cyclic Prohesion: ASTM D 5894

Scope and Field Application

The ASTM D 5894 test method is similar to BS 3900-F19 : ISO 11997-2 in that both are intended to simulate the effect on coatings of exposure to a salt-laden atmosphere in the presence of sunlight

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.

 


Sample Requirements

Ideally 150 x 75 mm coated (burnished steel) panels not more that 5 mm thick, although we can accommodate a limited number of 150 x 100 mm panels provided they are less than 5 mm thick. If you have smaller samples you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

The standard recommends running samples in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.


 

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Resistance to Cyclic Prohesion: BS 3900-F19, ISO 11997-2

Scope and Field Application

BS 3900-F19 and ISO 11997-2 are alternative names for the same method which is intended to measure the resistance of coatings to a defined cycle of UV radiation and salt spray. The standard states that the test cycles specified have been found useful for testing air-drying industrial maintenance coatings on steel.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.

Sample Requirements

Ideally 150 x 75 mm coated (burnished steel) panels not more that 5 mm thick, although we can accommodate a limited number of 150 x 100 mm panels provided they are less than 5 mm thick. If you have smaller samples you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

The standard recommends running samples in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.


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Resistance to Cyclic Salt Spray: BS EN 60068-2-52, IEC 68-2-52

Scope and Field Application

BS EN 60068-2-52 and IEC 68-2-52 are alternative names for the same method which is intended to measure how well components or equipment can withstand a salt-laden atmosphere. The method is designed to reproduce the corrosive effect of salt on metals where the mechanism is primarily electrochemical. It is also designed to reproduce the degradation of non-metallic materials by salt. In this case degradation is due to complex chemical reactions between salt and the materials involved.

We use this method mainly for testing electrical components and switchgear. If you need to test paints, coatings etc, you may wish to consider the prohesion test as a possible alternative.

There are no pass/fail criteria defined in the standard. This is a matter of agreement between the parties concerned.

Sample Requirements

The size of any object we can test is limited by the capacity of the salt spray chamber. In practice this means that the test object must be capable of fitting inside a cube with 500 mm sides.


 

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Resistance to Humidity: BS 3900-F2, BS EN ISO 6270, BS 3900-F9, ASTM D2247

Scope and Field Application

These tests give an indication of how well a painted surface will resist specified humidity/condensation conditions in the absence of corrosive pollutants. The methods all involve exposure to high humidity combined with a limited choice of temperatures. If you require a test with a wider range of temperature/humidity conditions, please refer to our Controlled Temperature and Humidity Exposure test on the Durability page. Coatings intended to resist prolonged contact with water can be assessed with the Resistance to Liquids tests described on the Mechanical Properties page.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.

Sample Requirements

The requirement is the same for all three tests. We need 3 coated panels (150 x 100 mm). The substrate should be one that is appropriate to the type of paint being tested.

If you wish, we can prepare the test panels. The quantity of liquid paint we needs depends on the method of application. We will be pleased to advise you regarding our requirements.

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Resistance to Prohesion: ASTM G 85-94 Annex A5

Scope and Field Application

This is a less severe version of the standard salt spray tests and is generally regarded as giving a better correlation with outdoor exposure results. The method involves mounting the test panels in a chamber into which is introduced an aqueous solution of salts in the form of a fine aerosol. The method differs from the standard salt spray tests in that the salt solution used in the prohesion test is much more dilute and the panels are not exposed to it continuously.

The test method was developed by British Rail and Mebon Paints and the term Prohesion is derived from a key concept of this development namely Protection is Adhesion.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.

We also offer cyclic prohesion testing. This involves subjecting the samples sequentially to prohesion followed by accelerated weathering.

Sample Requirements

We need 3 coated panels (150 x 100 mm). The substrate should be one that is appropriate to the type of paint being tested.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.

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Resistance to Salt Spray: BS 3900-F12, ISO 7253, BS EN ISO 9227, ASTM B 117

Scope and Field Application

These tests give an indication of how well a painted surface will resist salt water spray. You may also wish to consider the prohesion test as a possible alternative. The prohesion test is a less severe version of the standard salt spray tests and is generally regarded as giving a better correlation with outdoor exposure results.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.


Sample Requirements

The requirements are the same for all the tests. We require 3 coated panels 150 x 100 mm. The substrate should be the one that is appropriate to the type of paint being tested. We can test different size samples if required with maximum dimensions of 500 x 500 x 500 mm

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.


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Resistance to Salt Spray: BS 3900-F4

Scope and Field Application

This standard gives an indication of how well a painted surface will resist artificial seawater spray.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.


Sample Requirements

We require 3 coated panels 150 x 100 mm. The substrate should be the one that is appropriate to the type of paint being tested. We can test different size samples if required with maximum dimensions of 150 x 400 x 500 mm

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.

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Resistance to Sulphur Dioxide: BS 3900-F8, BS EN ISO 3231, ISO 3231

Scope and Field Application

BS 3900-F8 is identical to BS EN ISO 3231 and ISO 3231 The tests are designed to measure the resistance of a coating to a humid atmosphere containing sulphur dioxide.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.


Sample Requirements

In order to obtain a total test area of 0.5 square metres, we require 16 coated panels 150 x 100 mm. The substrate should be one that is appropriate to the type of coating being tested.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.

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Resistance to Sulphur Dioxide: DIN 50018

Scope and Field Application

The DIN 50018 standard is similar to BS 3900-F8 in measuring the resistance of a coating to a humid sulphur dioxide atmosphere.

Sample Requirements

We require 16 coated panels 150 x 100 mm. The substrate should be one that is appropriate to the type of coating being tested.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.


 

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Coatings News

Press Release Nov 17

9th November 2017

PRA granted UKAS accreditation

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Irfab releases first Global Industrial Coatings Market study module - Protective

23rd January 2017

PRA Irfab have released the first module of the new Global Industrial Coatings Market study, Protective.

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Woodcoatings Congress Proceedings

11th January 2017

Did you miss PRA’s 10th International Woodcoatings Congress? You can now buy a copy of the full proceedings and papers from the European Coatings Website!

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Christmas Shutdown

21st December 2016

We will be closed between Saturday 24th December 2016 and Monday 2nd January 2017.

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PRA Newsletter

7th December 2016

Click on the link to view PRA's new quarterly Newsletter

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PRA Press Release November 2016

30th November 2016

Notice of Management Buyout of PRA from Pera Technology Solutions

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Welcome to new Member Olin Epoxy!

21st October 2016

Welcome to our newest member - Olin Epoxy!

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Welcome to M&K Ghana

28th September 2016

PRA are pleased to welcome M&K Ghana to membership.

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Welcome to our new Member Synthomer

14th September 2016

Welcome back to PRA Synthomer!

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Welcome Dupre Minerals to PRA

28th July 2016

PRA is delighted to welcome another new member to the PRA - Dupre Minerals

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Autumn/Winter Training Courses Announced

22nd July 2016

PRA is delighted to preview its Autumn/Winter Training Courses for 2016.

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Coatings Events

Middle East Coatings Show

19th March 2018 - 21st March 2018
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Turkcoat & Paintistanbul 2018

22nd March 2018 - 24th March 2018
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American Coatings Show and Conference

9th April 2018 - 11th April 2018
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Surfex 2018

22nd May 2018 - 23rd May 2018
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CEPE Annual Conference + General Assembly 2018

26th September 2018 - 28th September 2018
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Woodcoatings Congress 2018

23rd October 2018 - 24th October 2018
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