Influence of Crystallinity on the Corrosion Rate of Chemically Vapor‐Infiltrated SiC f /SiC composites under 310 °C Hydrothermal Condition

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

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Structural and mechanical characteristics of ZA27-7 wt.% SiC composites produced by powder metallurgy techniques

Zeitschrift für Metallkunde ◽

10.3139/146.018004 ◽

2004 ◽

Vol 95 (8) ◽

pp. 704-707

Author(s):

Dušan Božić ◽

Aleksandar Devečerski ◽

Biljana Dimčić ◽

Miroljub Vilotijević ◽

Višeslava Rajković

Keyword(s):

Powder Metallurgy ◽

Mechanical Characteristics ◽

Sic Composites

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COOPER ALLOY 22W

Alloy Digest ◽

10.31399/asm.ad.ss0146 ◽

1963 ◽

Vol 12 (8) ◽

Keyword(s):

Corrosion Resistance ◽

Creep Rate ◽

Corrosion Rate ◽

Physical Properties ◽

High Strength ◽

Heat Treating ◽

Casting Alloy ◽

Hot Gas ◽

Gas Corrosion ◽

Very High

Abstract Cooper Alloy 22W is a high strength, heat resistant casting alloy with a low creep rate. It is recommended for heat applications where stress and hot gas corrosion rate are very high. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, joining, and surface treatment. Filing Code: SS-146. Producer or source: Cooper Alloy Corporation.

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Unique Autoclave Stress Induced Failure Mechanism

ISTFA 2005: Conference Proceedings from the 31st International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2005p0427 ◽

2005 ◽

Author(s):

John Butchko ◽

Bruce T. Gillette

Keyword(s):

Corrosion Rate ◽

Grain Boundary ◽

Failure Analysis ◽

Failure Mechanism ◽

Metal Corrosion ◽

Corrosion Mechanism ◽

Reliability Testing ◽

Process Change ◽

Transistor Reliability ◽

Pass Through

Abstract Autoclave Stress failures were encountered at the 96 hour read during transistor reliability testing. A unique metal corrosion mechanism was found during the failure analysis, which was creating a contamination path to the drain source junction, resulting in high Idss and Igss leakage. The Al(Si) top metal was oxidizing along the grain boundaries at a faster rate than at the surface. There was subsurface blistering of the Al(Si), along with the grain boundary corrosion. This blistering was creating a contamination path from the package to the Si surface. Several variations in the metal stack were evaluated to better understand the cause of the failures and to provide a process solution. The prevention of intergranular metal corrosion and subsurface blistering during autoclave testing required a materials change from Al(Si) to Al(Si)(Cu). This change resulted in a reduced corrosion rate and consequently prevented Si contamination due to blistering. The process change resulted in a successful pass through the autoclave testing.

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