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Immersion tin plating

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Immersion Sn plating soln. contains Sn (II) at least 0.25 moles/l, thiourea to give ratio of thiourea:SN(II) at least 10:1, and mineral acid to give pH < 1, as well as sufficient aromatic mononuclear sulphonic acid to prevent formation of loosely adherent, discoloured Sn deposit.

Immersion tin plating

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Conductive substrate is immersed together with piece(s) of Zn in bath containing Sn(II) ions 3-70 g/l, strong mineral acid 10-200 ml/l to maintain Sn(II) ions in soln. and nonylphenoxy-poly(ethyleneoxy) ethanol with mol. wt. 484-2400, 0.1-10 g/l, and effecting electroconductive contact between substrate and Zn. Bath is operated at 50-110°F.

Immersion tin plating

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Conductive substrate is Sn plated by immersing it with piece(s) of metallic Zn in bath containing Sn(II) ions 3-75, strong mineral acid 10-200, surface active agent which controls deposition 0.1-10 g/l at 50-110°F. cf. 4550037.

Immersion Tin Plating Bath

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Immersion Tin Plating Bath with Improved Adhesion

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Immersion tin plating of aluminium alloys

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Operating conditions for hot-dip tin coating of aluminium alloys are presented. Maintenance and control aspects are discussed including impurity build-up.

Immersion Tin Plating Process

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Process sol'n using an imidazole-2-thione complexing agent.

Immersion tin plating solution

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Bimetal bearing with Al and Fe metal surfaces is immersion Sn coated in acid soln. containing Sn(II) salt and wetting agent.

Immersion Tin Plating with Polysulphides

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Immersion Type Electroplating Anode

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Immersion Zinc Plating of Magnesium Alloys from Potassium Pyrophosphate

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PROT Graph shows thickness vs. immersion time (1 micron max) at 4 pH values and also effect of potassium fluoride conc'n. Advantages of pyrophosphate are explained. 7 refs

Immersion Zinc Plating onto Magnesium

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Immobilisation of inorganic chemical waste

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Immobilised antimicrobial agents.

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It is noted that ASTM sub-committee E35.15 on Antimicrobial Agents is responsible for more than 50 ASTM standards that are used for testing antimicrobial treated articles as well as topical antimicrobials and disinfectants versus bacteria, fungi and viruses. One of the most widely used of E 35.15 standards, ASTM E 2149, Test Method for Determining the Antimicrobial Activity of Immobilised Antimicrobial Agents under Dynamic Contact Conditions, has recently been revised. E 2149 is used to measure the direct antimicrobial activity of materials (for example, textiles and hard surfaces) treated with durable, non-leaching antimicrobial agents. The revision provides a more reproducible and reliable method consistent with other microbial standards within E35.15 E 2149 is reported to be a fast, reliable screening tool that may be used either during the development of a treated product or for routine quality control during production of articles treated with proven, non-leaching antimicrobial agents.

Immobilised titanium dioxide films as catalysts for photoelectrochemical detoxification of water

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JAE Title films were formed thermally, anodically and by sol-gel and tested in various reactor designs for degradation of model organics. Model organics included phenol, 4-chlorophenol, salicylic acid & starting conc'ns were typically 250 µM. TiO2 films eventually required renewal & supporting electrolyte was not necessary. 34 refs