The ornamental design for a corrosiontestchamber, as shown and described.
FIG. 1 is a front elevation view of corrosion test chamber showing our new design.
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a left end elevation view thereof;
FIG. 5 is a right end elevation view thereof; and,
FIG. 6 is a back elevation view thereof.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.