(19)

(11)

EP 0 169 901 A1

(12)

(43) Date of publication: 05.02.1986 Bulletin 1986/06 (21) Application number: 85901396.0 (22) Date of filing: 24.01.1985

(51) International Patent Classification (IPC):  C23F 13/ 04( . ) G01N 17/ 02( . ) (86) International application number: PCT/EP1985/000049 (87) International publication number: WO 1985/003311 (01.08.1985 Gazette 1985/17)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 24.01.1984 GB 19840001768 (71) Applicant: ALEXANDER CORROSION TECHNOLOGY LTD. Bracknell Berkshire (GB)	(72) Inventor: ALEXANDER, Roger Bracknell Berkshire (GB)