The word “passivation” is one that is thrown around quite a bit in the metal finishing and cleaning world and seems to have a world of different meanings to different people. Although the word passivation is normally associated with stainless steel, there are several other metals that can be “passivated” in one way or another. …
“Pulse” in ultrasonic terms simply means turning the ultrasonic energy on and off repeatedly in either a fixed or random pattern. At first it seems this would would be counter-productive to the goal of maximizing the ultrasonic cleaning effect. In fact, the blogs Ultrasonics – Ultrasonic Generators – What Is “Pulse” and Ultrasonics – Ultrasonic …
Certain benefits can be derived in ultrasonic cleaning and processing by “pulsing” the ultrasonic generator. In fact, different pulse rates and duty cycles produce different benefits. This blog explores how “pulse” works and how its variants benefit ultrasonic cleaning in different ways. An earlier blog described the basic function of the ultrasonic generator. Ultrasonics – Ultrasonic Generator …
Previous blogs have suggested the use of liquid sprays in air as either a primary mechanism or as an enhancement to both cleaning and rinsing operations. Today’s blog will discuss, briefly, what is important in choosing a spray nozzle or nozzles for a particular application. In order for spray to be effective, of course, the …
It is no secret that good cleaning followed by poor rinsing can be worse than not rinsing (or cleaning) at all. A single-use rinse using a fresh water spray or a high flow rate or single use immersion rinse are often thought to provide the ultimate rinse. These options, however, are often extremely expensive because they consume …
Previous blogs discussed the demise of solvents after the Montreal Protocol. Today, in the US at least, solvents are coming back prompting the reader to ask, “What Has Changed.” First of all, there was never any real argument that solvents did, and still do, a good job of cleaning in many, many applications! Are there aqueous and other alternatives …
From time to time here on the blog I will try to include some applications notes targeting specific cleaning applications and giving you a taste of the successes and challenges faced in each. Although you may not have a need for the specific information presented, you may, as cleaning technologists, find it interesting what other …
Rust is a potential problem whenever ferrous parts are being cleaned. There are several options available to prevent or eliminate rusting both during and after the parts cleaning process. Steel will rust if it is exposed to oxygen and moisture as discussed in the blog Some Things You Should Know About Rust. Although iron oxide (rust) gets …
In the period immediately following the signing of the Montreal Protocol, virtually every manufacturing facility using solvents for cleaning was faced a critical decision. The three basic options were – Discontinue unnecessary cleaning operations altogether. Upgrade or replace existing solvent-based cleaning systems to reduce solvent emissions. Switch to cleaning using water-based chemistry. Surprisingly, the first option, eliminating …
A dedicated reader has requested that the blog address rinsing in more detail. Rinsing ranks high on the list of process steps that are often not given their due attention in the specification of an overall cleaning process. Many specifications just say “rinse” and nothing more. In fact, rinsing is a secondary cleaning step intended to remove residuals left …
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