	US 7,517,443 B2
	Tin plating electrolyte composition and method for electroplating surfaces with tin
Vladimir Andreevic Paramonov, Moscow (Russian Federation); Vitalij Polikarpovic Vinogradov, Moscow (Russian Federation); Rafkat Spartakovic Takhautdinov, Magnitogorsk (Russian Federation); Angelo Frixione, Sant'Olcese (Italy); Michele Turchetto, Cividale del Friuli (Italy); Joseph Frimpong, Canfield, Ohio (US); Anatoliy Aleksandrovic Karpov, Magnitogorsk (Russian Federation); and Galina Sergeevna Guljaeva, Moscow (Russian Federation)
Assigned to Danieli & C. Officine Meccaniche S.p.A., Buttrio (Italy)
Appl. No. 10/593,924 PCT Filed Mar. 24, 2005, PCT No. PCT/EP2005/051390 § 371(c)(1), (2), (4) Date Sep. 21, 2006, PCT Pub. No. WO2005/090646, PCT Pub. Date Sep. 29, 2005.
Claims priority of application No. 04425208 (EP), filed on Mar. 24, 2004.
Prior Publication US 2007/0131559 A1, Jun. 14, 2007
Int. Cl. C25D 3/32 (2006.01); C25D 7/06 (2006.01); C25D 5/36 (2006.01); C25D 5/48 (2006.01); C23C 16/00 (2006.01)

U.S. Cl. 205—140 [205/154; 205/217; 205/220; 205/225; 205/226; 205/302; 106/1.25]

7 Claims

1. A composition to be used in a process for electroplating surfaces with tin, said composition comprising the following components (g/l):


	Tin (in a form of tin sulfamate)	50-90
	Sulfamic acid, free	40-100
	Sulfates, in a form of SO₄²⁻	0-15
	Nitrogen-bearing block copolymer	1-6
	of propylene oxide and ethylene oxide

said copolymer having a molecular weight of 3950 to 6450, said copolymer further having a number of ethylene oxide links-to-number of propylene oxide links ratio of 1.4-1.2:1.0 at initial buildup of required number of links from propylene oxide followed by oxyethylation, the composition having a pH of 0.6 to 1.1.