8.1 Surface processing

These flashcards cover key concepts and processes from the Fundamentals of Manufacturing course, focusing on surface processing, coating methods, and the properties of various materials.

What is the primary purpose of diffusion in surface processing?

Diffusion impregnates the surface with foreign atoms, increasing hardness and wear resistance.

What are two common surface hardening treatments for steels?

Carburizing and nitriding.

What is electroplating?

An electrolytic process that deposits metal ions from a solution onto a cathode work part.

What is the difference between carburizing and nitriding?

Carburizing diffuses carbon into the surface for deeper hardening, while nitriding diffuses nitrogen for a harder surface at a lower temperature.

What type of coating is used in galvanizing?

Zinc is coated onto steel or iron for corrosion protection.

What does the term 'stiction' refer to in manufacturing?

Static friction that must be overcome for motion between two stationary objects made from the same polymer.

Name the chemical conversion coatings used for corrosion resistance.

Phosphate and chromate conversion coatings.

What is the primary benefit of anodizing aluminum?

Produces a stable oxide layer that provides corrosion protection and can be decorative.

What two processes are family methods of vapor deposition?

Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD).

What are some advantages of organic coatings?

Wide variety of colors, surface protection, low cost, and ease of application.

What is the main application of electroless plating?

Plating techniques that do not require electrical power and can coat complex geometries evenly.

What are the key reasons for coating metal parts?

Corrosion protection, enhancing appearance, wear resistance, and preparing surfaces for further processing.

What temperature is typically required for carburizing?

Around 900 °C (1652 °F).

What characterizes hot dipping methods?

Immersion of a metal substrate in molten metal for coating, primarily for corrosion protection.