ams - branson - basics of cleaning - aqueous

8/7/2019 AMS - Branson - Basics of Cleaning - Aqueous

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AMS Materials LLC 866-772-5108 BRANSON

BRANSON PRECISION CLEANING

Basics of Cleaning


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BRANSON PRECISION CLEANINGBasics of Cleaning

The Four Components of Cleaning

The cleaning agent

The cleaning equipment

The cleaning technique

The cleaning environment


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Analysis of a Cleaning Problem

Components

Soils

Cleaning agents

Equipment


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Types of Soils Organic (solvent soluble)

Oils, greases, rosins, etc. (non-polar)

Inorganic (water soluble)

Water soluble salts, plating salts, chlorides,

etc. (polar)

Particulate (insoluble) Materials of construction, chips, dust, dirt,

environmental fallout


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The Ideal Cleaning Agent

Non flammable Low surface tension

Non toxic High densityStable to heat Low viscosity

Stable to moisture Product purity

Stable composition Compatibility

Environmentally acceptable Cost effective


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Cleaning Agents

Aqueous

Halogenated

Hydrocarbon

Oxygenated


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Cleaning Agents

Aqueous

Water

Water and additives

Semi-aqueous




Cleaning Agents Halogenated

Chlorinated

HCFC

HFC

HFE

Brominated




Hydrocarbons

Aliphatic

Aromatic

Oxygenated

Alcohols

Ketones




Equipment Selection Review the application

Review the features required for each step of the

process

Incorporate each customers utilities and special

needs

Determine production requirements

Consider environmental constraints

Choose the appropriate cleaning equipment

Pick support equipment as required



APPLICATION

Can the parts NO SOLVENT

see water SYSTEM

YES

Is the soil removable NO SOLVENT

with aqueous chemistry SYSTEM

YES

Is the company mandated NOto get out of solvents

WHAT IS THE BEST

YES SYSTEM FOR THE

Aqueous system CUSTOMER




BRANSON PRECISION CLEANINGApplication Process Considerations




Remember All cleaning agents have an environmental impact

Objective

Eliminate

Air emissions

Water pollution

Waste disposal

Conclusion

Elimination is not feasible; we must minimize and

control environmental impact



BRANSON PRECISION CLEANING

Aqueous and Semi-Aqueous

Chemistry



BRANSON PRECISION CLEANINGAqueous Chemistry

Cleaning Solutions

pH denotes acidity or alkalinity / scale of 1 - 14

7 is neutral

Less than 7 - increasing acidity

More than 7 - increasing alkalinity


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BRANSON PRECISION CLEANINGpH Level versus Cleaning Time


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Cleaning Solutions

Water (tap and deionized)

Water and surfactant

Alkaline

Acid

Emulsifiers

Oil splitting


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Cleaning Solutions

Water-based chemistry

Dissolve water soluble soils

Reduce surface tension

Form emulsions

Suspend insoluble particles and prevent re-

deposition


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Cleaning Solutions Effective on:

Inorganic salts and mineral compounds

Rosin flux removal

Oil and lubricants

Buffing compounds

Particulates

Scales

Oxides


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BRANSON PRECISION CLEANINGTemperature versus Cleaning Time

Soil solubility

increases with

temperature

Ultrasonic activity

decreases with

temperature


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Rinsing Solutions

Tap water

Softened water

Reverse Osmosis water (RO)

Deionized water (DI)

Distilled water


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Water quality scale Good quality tap water - 4 K ohms = 125 PPM

100 K ohms = 5 PPM

500 K ohms = 1 PPM

1 M ohms = 0.5 PPM

5 M ohms = 0.1 PPM

10 M ohms = 0.05 PPM

High quality D.I. water - 18 M ohms = 0.02 PPM


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Water QualityResidue remaining after drying

48,000 ppm

4,800 ppm

480 ppm

0.28 ppm

Tap Water

(5 Megohm)


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Water Quality

DEIONIZED WATER QUALITY

Resistance

(Megohms)Conductance

(Microsiemens)Total Dissolved

Solids (ppm)

18.2 0.055 None

10.0 0.100 0.115

4.0 0.250 0.288

1.0 1.000 1.150

0.4 2.500 2.875 Lower Quality

Higher Quality


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Water Quality

In precision applications the quality of the rinse

water itself can be a factor

Ground water, hard or soft, can create rinsing issues

Most precision processes use deionized (DI) water Ions removed by polar exchange in special resin beds

Organics removed by activated carbon beds

Bio-contaminants controlled with UV light/filtration

Quality evaluated by monitoring conductivity or resistivity


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AMS M t i l LLC 866 772 5108 BRANSON

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