Exhibit 32.2

CERTIFICATION

                      Pursuant to 18 U.S.C. § 1350, the undersigned officer of Alcan Inc. (the "Company"), hereby certifies, to such officer's knowledge, that the Company's Quarterly Report on Form 10-Q for the quarter ended March 30, 2005 (the "Report") fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: 10 May 2005                                                               

                                                                                          /s/ Geoffery E. Merszei

Geoffery E. Merszei

                                                                                          Executive Vice President and Chief Financial Officer