摘要:
An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate is disclosed and comprises zinc ions and an amount, sufficient to provide a level and bright deposit, of at least one bath-soluble composition obtained by the reaction of a nitrogen-containing heterocyclic compound with formaldehyde, an epihalohydrin or glycerol halohydrin and at least one amino compound selected from the group consisting of (i) ammonia, (ii) an aliphatic amine, or (iii) an amidine. Additionally, the plating baths of the invention may contain a nitrogen-containing compound obtained by the reaction of ammonia, an aliphatic amine containing at least one primary amine group, or mixtures thereof with one or more epihalohydrins, glycerol halohydrins or mixtures thereof. Thioureas and anionic aromatic sulfonic acids or salts thereof also are contemplated as being useful in the plating baths of the invention. Methods for depositing a bright zinc coating over a wide range of current densities also are described.
摘要:
A method of treating metal parts to provide durable and rust-inhibiting coatings is described. The application method can be used to treat single parts or bulk barrel processing of parts. The method comprises the steps of(a) phosphating the metal parts with an aqueous metal phosphating solution,(b) electrophoretically depositing a siccative organic coating on the phosphated metal parts, and(c) applying a corrosion inhibiting film of oil as a seal coat.
摘要:
An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate is disclosed and comprises zinc ions, ammonium ions and at least one aromatic sulfonic acid or salt having the general formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently hydrogen or lower alkyl groups,X is hydrogen, ammonia or any metal with the proviso that the metal sulfonate is soluble in the bath, andA is a saturated, unsaturated or aromatic ring.Additionally, the plating baths of the invention may contain aromatic carbonyl-containing compounds and particularly aromatic aldehydes containing at least one halogen substituent. Polyoxyalkylated naphthols and polyalkylene glycol ethers as well as poly(alkyleneimines) also are contemplated as being useful in the plating baths of the invention. Methods for depositing a bright zinc coating over a wide range of current densities, and additive compositions for preparing plating baths useful in these methods also are described.
摘要:
An aqueous acid plating bath for electrodeposition of tin, lead or tin-lead alloys on a substrate is described and comprises at least one metal salt selected from the group consisting of a stannous salt, a lead salt or a mixture of stannous and lead salts, and as a brightener agent, an effective amount of at least one alkoxylated amine of the formula ##STR1## wherein R is a fatty acid alkyl group containing from about 8 to about 22 carbon atoms,R.sup.1 is an alkylene radical containing up to about 5 carbon atoms,R.sup.2 and R.sup.3 are each independently an ethylene or propylene group,A is 0 or 1, andX, y and z are each independently integers from 1 to about 30, and the sum of x, y, and z is an integer of from about 2 to about 50.Methods for the electrodeposition of tin, lead, or tin-lead alloys from such baths as well as additive compositions for forming the baths also are described.
摘要:
Nitrogen and sulfur compositions are described which are useful in aqueous acidic plating baths and processes for electrodepositing bright and level copper coatings. The compositions are prepared by reacting a mixture of(a) a disulfide having the formula[RR'NCS.sub.2 ].sub.2 (Formula I)wherein R and R' are each independently hydrogen, alkyl or aryl groups, and(b) a halo hydroxy sulfonic acid having the formulaX(CH.sub.2).sub.n CHOH--CH.sub.2 SO.sub.3 M (Formula II)wherein X is a halogen, n is one or two and M is hydrogen or an alkali metal, in(c) an aqueous alkaline medium.Particularly bright and level deposits are obtained when the reaction mixture used to form the composition also contains an aliphatic aldehyde containing up to three carbon atoms. The presence of the above-described brightening and leveling agents in acid copper plating baths produces a lustrous, smooth and level deposit of copper over a wide range of current densities, particularly when wetting agents are included in the plating baths.
摘要:
The present invention provides an ammonia-free acid zinc plating bath for electrodepositing bright zinc on a substrate in which the zinc deposit produced thereby is ductile and presents a glossy to bright coating on the substrate over a wide cathodic current density range. The ammonia-free acid zinc plating baths of the invention comprise zinc ions, chloride ions, at least one polyoxyalkylated naphthol, at least one aromatic carboxylic acid or bath-soluble salt thereof, and at least one anionic aromatic sulfonic acid or bath-soluble salt thereof. In addition to the above components, the ammonia-free acid zinc plating baths of the invention may contain at least one nonionic polyoxyethylene compound and at least one aromatic aldehyde, ketone, or mixtures thereof. The ammonia-free acid zinc plating baths of the invention are free from significant amounts of complexing agents that would impede the removal of zinc ions from the baths prior to disposal.