Coating & Extrusion Die Compositions

• SS 400

• Honeycomb Extrusion Dies – TiN, TiC, TiCN (coatings)

carbon 0.05 silicon 1

Manganese 1 chromium 12

phosphorus 0.03 aluminum 0.25

sulfur 0.03 iron 85.64

Fundamentals of the Reaction

SS 400 Extrusion Die

TiN, TiC, or TiCN

Mono-Layer

Multi-Layer

Bulk

Reaction Equations Set Up

• Define the underlying reactions• Obtain redox potentials and equilibrium

constants for perspective reactions• Utilize non-linear reaction program analysis to

generate reaction scheme • Define optimization based on reaction scheme

Reaction Sets

• Redox Reactions– Decomposition of H2O2 – Acidic Stabilization– Ti Redox reactions

Conditions & Functionalities

• H2O2 concentration– 35-50% composition

• Temperature Range– Decomposition Temp H2O2 = 140F

• 2 acid system – Purpose of phosphoric acid– Addition of Nitric Acid or Sulfuric Acid– Amounts depend on % H2O2

From US Patent 0023943

Variable Stripping Parameters

Polarization Cell Components

• Test Sample• Two Auxiliary Electrodes • Luggin Capillary • Salt Bridge Connection• Inert Gas Connections• Thermometer• Glass Container

Functionality of Polarization Cell

• Adjusting potential of auxiliary electrode 1 to match the potential of the sample.

• Measuring the current flowing across the other auxiliary electrode 2 and sample.

• Reference current flowing between the two auxiliary electrodes.

• Generation of a Taffel plot • Taffel plot deduced corrosion rate [mass/time]

Specifications