Marine Corrosion Club logo

 

Minutes of the General Meeting held at The Novotel, Birmingham International Airport, Birmingham, on Wednesday, 6th July 2005.

  PERSONS PRESENT:

Clive Tuck – Langley Alloys, Meighs Ltd (MCF Chairman)

Phil Dent – Bodycote (Vice Chairman)

Keith Stokes – MoD (DSTL) (Imm. Past Chairman)

David Howarth – Lloyd’s Register (committee)

Robin Jacob- Corrosion Consultancy (committee)

Robin Oakley – QinetiQ (committee)

Matthew Peet – Sheffield Testing Labs (committee)

Barry Torrance – Aish Technologies  (committee)

Robert Wood – Southampton University (committee)

Jean Tuck – MCF Secretariat

Rakesh Barik - Southampton University

Charlie Barraclough – Commtech Associates

Derek Bates – DRB Materials Technology (speaker)

Paul Blythe – Southampton University

Lily Chambers - Southampton University  

Brian Connolly – University of Birmingham (guest)

John Fowler – Rolls Royce

John Galsworthy – QinetiQ

Terry Harvey - Southampton University

Amira Kawar - Southampton University

Mike Lawrence - KBR

Briony Lee - TWI

Len Phillips – Weir Pumps

Carol Powel – CDA & NI

Chris Scales – BAE Systems

Wilhelm Schleich – KME Metal

Geir Magne Selvig – Frese Metal (guest)

Klaus Steinkamp – KME Metal

Mandar Thakare - Southampton University

Julian Wharton - Southampton University

APOLOGIES  

Chris Amon – Aker Kvaerner

Stuart Bond – TWI

Peter Cutler - NI

Jagath Mawella – Sea Technology (MoD)

 

The Chairman (Clive Tuck) opened the meeting.  

1.   MCF NEWS

1.1     The Chairman opened the meeting.  He mentioned that the management committee had proposed holding a 2½-day conference on: ’Offshore Materials & Corrosion: 40 Years On’, in 2006.  The purpose would be to review the last 40 years of offshore engineering with respect to materials used and the applications experience.  This would encompass offshore engineering philosophy, material developments over the period, particular corrosion phenomena which have occurred, advances in cathodic protection methods and corrosion management system improvement.  NACE have shown an interest and would discuss it at their committee meeting today (6th July).  ICorr in Aberdeen were also interested.  It could perhaps be held in June/July 06, in Edinburgh.  The MCF Birmingham meeting ’06 would then be held in April.  

The Chairman also gave an update on the progress of the collaborative research project .  

1.2    The Secretariat presented the list and topics of forthcoming meetings.  Any member wishing to make a presentation was advised to volunteer soon, while the programme was being finalised.  She also reminded members that CPD certificates were available after the meeting for those who wished to use these meetings to build up their CPD portfolio. 

          A brief statement on the MCF accounts was given. 

2.   TECHNICAL PRESENTATIONS (part 1):   [Click for abstracts]

2.1      ‘Corrosion Performance of Nickel Aluminium Bronze (NAB) Under Seawater Immersion and Erosion-corrosion Conditions’, Rakesh Barik, Julian Wharton & Robert Wood (Surface Engineering & Tribology Group, School of Engineering Sciences, Southampton University) & Keith Stokes (DSTL)

2.2      ‘Welding Issues with Copper Alloys’, Mike Gittos & Chris Punshon (TWI), presented by Briony Lee  

3.   OPEN FORUM

1.   John Fowler asked whether anyone had experience of exposed carbon fibre (in epoxy) against nickel aluminium bronze in seawater.  It was suggested that insulation might be looked at, although there was a consensus that insulating with epoxy was difficult.  Information has been gathered by DERA on the subject, but this largely concerns carbon fibre corroding aluminium.  There is a DERA report which advocates the use of glass, although this would cause loss of other benefits. 

2.   Barry Torrance (Aish) mentioned that his company had been doing experimental work on small signal frequency responses between ICCP elements, and invited anyone interested to discuss this with him after the meeting. 

3.   Derek Bates (DRB Materials) had been looking at aluminium extrusions for the marine industry.  These were anodised in a chromic acid bath, and there were resulting patchy anodised areas with some black and some shiny.  This was not acceptable to clients, and a solution had not yet been found.  Clive Tuck (Langley) said that this was a common problem, particularly seen on the thicker parts and welds of aluminium extrusions (AlMgSi) after colour anodising.  It is caused by high iron content.  This influences the size and distribution of the Al-Fe-Si phase particles which come out on grain boundaries.  It was therefore necessary to be selective about the source of the aluminium.  Even if the overall average iron content of differently sourced samples might be equivalent, the micro-structural form of the iron is a controlling factor.  The effect is also seen if there is a high copper content, although it becomes less if a small amount of nickel is present in the AlMgSi alloy. 

4.   Mike Lawrence (KBR) asked whether there was an acceptable method for the preconditioning of a Cu-Ni pipework cooling system if it had been run with less than perfect seawater and left damp for a while.  In such a case, once in service, it could already be corroded.  Is there any solution which can be washed through to improve the situation?  Wilhelm Schleich (KME) mentioned that there were standards available: 

NES 781 Issue 3 Sep 1990 and VG 85004-8:1995 (in German).  Both standards deal with NaDDTC-treatments of the CuNi-Systems.  (This NES covers the process and procedure to be used to prevent excessive corrosion of ships sea water system and heat exchangers due to use of sulphide polluted sea-water during construction).  In general, the content of both standards is similar. However, the NES prescribes an electrochemical method for the evaluation of the treatment quality, but the VG limits the evaluation to visual means only.  

As to prolonged exposure of Cu-Ni pipe to polluted seawater, the Royal Navy heat treat Cu-Ni to improve its oxide film, and use resistance polarisation sensors to control iron anodes which are used to produce iron dosing of the system.

4.    TECHNICAL PRESENTATIONS  (part 2):  

4.1   ‘Long-term and Accelerated Corrosion Performance of Cast Nickel Aluminium Bronze in Seawater’, Robin Oakley and John Galsworthy (QinetiQ)  

Part 1 :  ‘Long-term and Accelerated Corrosion Testing Methods for Copper-Based Alloys in Seawater’, R.S. Oakleya*, J.C. Galsworthya, K.R. Stokesb, G.S. Foxa   [a QinetiQ Ltd, Cody Technology Park, Farnborough, Hampshire, UK. GU14 0LX; b Defence Science Technology Laboratory, Porton, Salisbury, Wiltshire, UK. SP4 0JQ]

Part 2:  ‘Some observations made during the destructive examination of cast nickel aluminium bronze seawater system components after service’, John C. Galsworthy and Robin S. Oakley, QinetiQ Ltd.,  Cody Technology Park, Farnborough, GU14 0LX, UK 

4.2    ‘Learning from Failures’, Derek Bates (DRB Materials Technology Ltd)

The Chairman closed the meeting at approx. 3:45 pm


MCF home page