Other

Ishihara Chemical Co., Ltd.

Daiwa Fine Chemicals Co., Ltd.

Obata, Doni, Daiwa, Fine Chemicals Co., Ltd.

Ishibara Chemical Co., Ltd.

Obata, Dohi, Daiwa Fine Chemicals Co. Ltd.

Ishihaa Chemical Co., Ltd.

Yukiyoshi Okada

Keigo Obata

Yoshiaki Okuhama

Seishi Masaki

Nobuyasu Dohi

Masakazu Yoshimoto

Tadashi Yoshida

A tin, lead, or tin-lead alloy plating bath comprising, as essential ingredients, an alkali metal salt, and a soluble divalent tin compound or/and a lead compound, all of an aliphatic or aromatic sulfocarboxylic acid of the general formula ##STR1## wherein R is a C.sub.1-4 hydrocarbon radical, M.sub.1 is a hydrogen atom or alkali metal atom, M.sub.2 is an alkali metal atom, and X.sub.1 and X.sub.2 are each a hydrogen atom, OH, COON, or SO.sub.3 N (where N represents a hydrogen atom or alkali metal atom).

Tin, lead, or tin-lead alloy plating bath

A tin-lead alloy plating bath based on a principal plating bath comprising an alkanesulfonic or alkanolsulfonic acid and both bivalent tin and lead salts thereof is characterized by the addition of a guanamine compound having the general formula ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, represent each a hydrogen atom, C.sub.1-18 straight- or branched-chain alkyl radical, C.sub.1-18 straight- or branched-chain alkoxy-lower alkyl radical, or a C.sub.3-7 cycloalkyl radical, or R.sub.1 and R.sub.2 may combine to form a carbon cycle or hetero cycle, and A represents a lower alkylene radical.

Tin-lead alloy plating bath

A tin, lead or tin-lead alloy plating bath, which comprises

Tin, lead, and tin-lead alloy plating baths

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Kobe, Japan

Yukiyoshi Okada