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Solution Controls Stannous and lead fluoborates are the source of metal. Their concentrations and ratio must be strictly maintained, as they will directly affect alloy composition. Fluoboric acid increases the conductivity and throwing power of the solutions. Boric acid prevents the formation of lead fluoride.Additives promote smooth, fine-grained, tree-free deposits. Excess peptone (three to four times too much) may cause pinholes (volcanoes) in deposit when reflowed. Testing by Hull cell and periodic carbon treatments is indicated. The peptone add rate is about 1 to 2 qt per week for a 400 gal tank. Only DI water and contamination-free chemicals should be used for example, <10 ppm iron-free and <100 ppm sulfate-free fluoboric acid. A clear solution is maintained by constant filtration.

Deposition Rate A layer of 0.5 mil tin-lead is deposited in 15 to 17 min. at 15 to 17 A/ft2. The best practice is to plate at 10 to 25 A/ft2 (2.3 copper current). Higher currents lead to coarse deposits and more tin in the alloy. Excessive current causes treeing and sludge formation.

Deposit Composition The composition should be 60 percent tin to 40 percent lead. The composition should be confirmed with a deposit assay.Alloy composition is determined by the ratio of tin and lead in the solution; thus Sn (oz./gal) + [total Sn + Pb (oz./gal)] 100 = %Sn (29.2).

Hull Cell This test shows overall plating quality and the need for peptone, additives, or carbon treatment, as well as the presence of dissolved copper in the solution.

Visual Observation of Plating When plated, solder has a uniform matte finish. The deposit should be smooth to the touch. A coarse, crystalline deposit usually indicates the need for additives or peptone or a current density that is too high. Peeling from copper is generally related to the procedure. The fluoboric acid predip should not be used as a holding tank (for more than 5 min.) prior to solder plating. Acid strength and cleanliness are also important in this case. Load the tank with some residual current (5 to 10 percent). Rough, dark, thin, or smudged deposits may be due to organic contamination and may require carbon treatment. Dark deposits, especially in low-current-density areas and in the plated through hole, are due to copper contamination or to thin plating. A Hull cell test will confirm deposit, and a dummy plate will remove copper.

The G tt component of the Einstein tensor for the Tolman metric is given by (a) G tt = 0 (b) G tt = 1 R e2 2R + 2R + R 1 R 2 2 R R + 1 + R 2 (c) G tt = (d) G tt =

Keep the bath composition in balance. Use contaminant-free chemicals. Dummy-plate once a week at 3 to 5 A/ft2. Circulate the solution through a filter continuously. Maintain additives by Hull cell and by analysis. Analyze for copper, iron, and nickel at least once a month. Carbon-treat on schedule.

Tin is used extensively for plating electronic components and PC boards due to its solderability, corrosion resistance, and metal etch-resist properties. The current MIL-STD-275 does not include tin plating, although earlier versions stated a required thickness of 0.0003 in. Specifications covering tin plating are MIL-T-10727 and MIL-P-38510, which say that tin must be fused on component leads.

Acid Tin Sulfate This is the most widely used system. Among the many processes available, some produce bright deposits for appearance and corrosion resistance; others give matte deposits, which can be fused as well as soldered after long-term heating. Tin sulfate baths are somewhat difficult to control, especially after prolonged use.2,3 Table 29.7 describes their operation and control. 29.8.1.1 Process Controls Agitation A filter pump circulates the solution without allowing air to be introduced. Cathode rod agitation is also useful for a wider range of plating current densities. Filtration A 3 to 10 mm polypropylene filter is needed to control excess cloudiness and sludge formation. Temperature The preferred temperature for deposit luster and visual appearance is 60 to 65 F. Use cooling coils. Baths can operate up to 85 F, but may result in smoky, hazy deposits. Carbon treatment Light carbon filtration at room temperature removes organic contaminations. New baths are also made up if problems continue with deposit quality, solderability, thickness control, and cost-effectiveness.

TABLE 29.7 Acid Tin Sulfate: Operation and Control Operating conditions: Tin Sulfuric acid Carrier, additives Temperature Cathode current density Current efficiency Plating rates Anodes: Type Composition Bags Hooks Length Current density