Cyclic Corrosion Tests Under Modern Environmental Conditions for the Automotive- Steel- And Aluminum Industries

7/25/2019 Cyclic Corrosion Tests Under Modern Environmental Conditions for the Automotive- Steel- And Aluminum Industries

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Cyclic Corrosion Tests under Modern

Environmental Conditions for the

Automotive-, Steel- and AluminumIndustries


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1. Overview Corrosion

2. New Test Requirements

3. Overview ERICHSEN Corrosion Test Equipment

Index

Corrosion Equipment to Improve

your Product Quality


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Galvanic Corrosion

1. Overview Corrosion

Pitting Corrosion

Rust


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Corrosion means the breaking down of essential properties in a material due

to chemical reactions with its surroundings. In the most common use of the

word, this means a loss of electrons of metals reacting with water and oxygen.

Weakening ofiron due to oxidation of the iron atoms is a well-known example ofelectrochemical corrosion. This is commonly known as rusting. This type of

damage typically produces oxide(s) and/or salt(s) of the original metal.

Corrosion can also refer to the degradation of ceramic materials as well as the

discoloration and weakening of polymers by the sun's ultraviolet light.

Most structural alloys corrode merely from exposure to moisture in the air, but

the process can be strongly affected by exposure to certain substances (see

below). Corrosion can be concentrated locally to form a pit or crack, or it can

extend across a wide area to produce general deterioration. While some efforts

to reduce corrosion merely redirect the damage into less visible, lesspredictable forms, controlled corrosion treatments such as passivation and

chromate-conversion will increase a material's corrosion resistance.


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Microbial Corrosion

Corrosion

Corrosion of glasses

Intergranular Corrosion


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2. New Test Requirements


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CYCLIC-CORROSION-TEST NEW

Information from VDA/VDEh Working GroupZyklische Laborkorrosionsprfung

Dr.Ing. K.H. Stellnberger

voestalpine Stahl GmbH

www.voestalpine.com/stahl


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Fundamentally Questions:

What is the correct laboratory-corrosion-test for development and

evaluation of advanced materials

and coatings?

How is the correlation between thistest and the OEM-corrosion-tests?


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Procedure

Evaluation of the situationof the actual corrosion tests and requirements for large-scale production

(static- and cyclic-corrosiontests)

Definitionpractically relevant test-specimen for cosmetic- and flange-corrosion

and a brand new cyclic-corrosion-test

Validation

VDA Test 621-415, OEM corrosiontests

and new test-procedures based on referenz-test-samples


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WORKGROUP: 15 Participants

Car Industry

Automotiv Supply Industry

Aluminumindustry

Steel Industry


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Aim of the test-procedure is to comply with the requirementsdefined by the workgroup

defined test-cycle within small tolerances (repeatability, etc.)

applicability for all relevant materials (steel, aluminum, etc.)

applicability for all relevant tests (cosmetic corrosion, etc.)

Execution: The test consists of three cyclesA

B

C

Salt-Spray-Cycle

Specimen-Assessment-Cycle

Low-Temperature-Cycle

The cycle will be proceeded in a defined sequence

The test-result-indikation takes place in weeks


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Testcycle new Cyclic-Corrosion-Test

one test-week


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one test-week

Sequence of Cycles


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Testcycle A graphically

Time, h


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Time [h] Temperature [C] Rel. Humidity [%] Comment

1

2 35 const. 100 const Salt-Spray-Phase

3 (NaCL 1%, pH 6.5 7.1)

4 ramping 35 to 50 (0.125 K/min)

5

6

7 ramping 100 to 50 (0.1 %/min)

8

9

10

11

12 50 const. 50 const

13 ramping 50 to 70 (0.33 %/min)

14

15 ramping 70 to 90 (0.1 %/min)

16

17

18 90 const

19 ramping 90 to 95 (0.1 %/min)

20 ramping 50 to 35 (0.125 K/min)

21

22 35 const 95 const

23

24

Test-Cycle A (Salt-Spray-Cycle; duration 24h)


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Testcycle B graphically

Time, h


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1

2 ramping 35 to 25 (0.5 K/min) ramping 95 to 70 (0.14 %/min)

3

4

5 25 const. Specimen-Assessment-Phase

6

7

8

9 ramping 25 to 50 (0.1 K/min) 70 const

10

11

12

13

14

15 50 const. ramping 70 to 90 (0.1 %/min)

16

17

18 90 const

19 ramping 90 to 95 (0.1 %/min)

20 ramping 50 to 35 (0.125 K/min)

21

22 95 const

23 35 const

24

Test-Cycle B (Specimen-Assessment-Cycl; duration 24h)


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Testcycle C graphically


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1

2 ramping 35 to 50 (0.125 K/min) ramping 95 to 70 (0.14 %/min)

3

4

5

6

7 -15 const. undefined Low-Temperature-Phase

8

9

10

11

12 ramping -15 to 50 (0.22 K/min) ramping undefined to 70

13

14

15 ramping 70 to 80 (0.16 %/min)

16 ramping 80 to 90 (0.08 %/min)

17 50 const.

18 90 const

19 ramping 90 to 95 (0.1 %/min)

20 ramping 50 to 35 (0.125 K/min)

21

22 95 const

23 35 const

24

Test-Cycle C (Low-Temperature-Cycle; duration 24h)


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Filiform-Corrosion

Steel

Filiform-Corrosion

Aluminum


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3. Overview

ERICHSEN Corrosion Test Equipment


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Mod. 616 / 1000 l

Cyclic-Corrosion

Testing Eqipment for

carrying out the CCT

VDA NEW

CCT Chamber with Option forTemperature- and Humidi ty-Regulation

(up to -20 C and 30 to 100 % rel.

Humidity)


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Optional Accessories Mod. 616

Renault D 17 2028 ECC-1 Kit

Salt spray (vertically down) Water fog humidity

Liquid Immersion Facility

Salt spray (horizontal mistspray)


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Corrosion-Test-Equipment forHumidity-Test

Mod. 519

Standart

Mod. 519

fully automatically

Kesternich-Test

Mod. 529

Especially for Large Size Test-Samples


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Mod. 608 / 2000 lMod. 606 / 1000 l + 400 l

Salt-Spray and Cyclic-Corrosion Chambers


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Salt-Spray and Cyclic-Corrosion Chambers

Mod. 610 / 610e Mod. 612 / 614 / 616


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Thank you very much

for your attention.

Documents

Cyclic Corrosion Tests Under Modern Environmental Conditions for the Automotive- Steel- And Aluminum Industries